This file is indexed.

/usr/share/aptitude/README is in aptitude-common 0.8.10-6ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
5842
5843
5844
5845
5846
5847
5848
5849
5850
5851
5852
5853
5854
5855
5856
5857
5858
5859
5860
5861
5862
5863
5864
5865
5866
5867
5868
5869
5870
5871
5872
5873
5874
5875
5876
5877
5878
5879
5880
5881
5882
5883
5884
5885
5886
5887
5888
5889
5890
5891
5892
5893
5894
5895
5896
5897
5898
5899
5900
5901
5902
5903
5904
5905
5906
5907
5908
5909
5910
5911
5912
5913
5914
5915
5916
5917
5918
5919
5920
5921
5922
5923
5924
5925
5926
5927
5928
5929
5930
5931
5932
5933
5934
5935
5936
5937
5938
5939
5940
5941
5942
5943
5944
5945
5946
5947
5948
5949
5950
5951
5952
5953
5954
5955
5956
5957
5958
5959
5960
5961
5962
5963
5964
5965
5966
5967
5968
5969
5970
5971
5972
5973
5974
5975
5976
5977
5978
5979
5980
5981
5982
5983
5984
5985
5986
5987
5988
5989
5990
5991
5992
5993
5994
5995
5996
5997
5998
5999
6000
6001
6002
6003
6004
6005
6006
6007
6008
6009
6010
6011
6012
6013
6014
6015
6016
6017
6018
6019
6020
6021
6022
6023
6024
6025
6026
6027
6028
6029
6030
6031
6032
6033
6034
6035
6036
6037
6038
6039
6040
6041
6042
6043
6044
6045
6046
6047
6048
6049
6050
6051
6052
6053
6054
6055
6056
6057
6058
6059
6060
6061
6062
6063
6064
6065
6066
6067
6068
6069
6070
6071
6072
6073
6074
6075
6076
6077
6078
6079
6080
6081
6082
6083
6084
6085
6086
6087
6088
6089
6090
6091
6092
6093
6094
6095
6096
6097
6098
6099
6100
6101
6102
6103
6104
6105
6106
6107
6108
6109
6110
6111
6112
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
6128
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
6144
6145
6146
6147
6148
6149
6150
6151
6152
6153
6154
6155
6156
6157
6158
6159
6160
6161
6162
6163
6164
6165
6166
6167
6168
6169
6170
6171
6172
6173
6174
6175
6176
6177
6178
6179
6180
6181
6182
6183
6184
6185
6186
6187
6188
6189
6190
6191
6192
6193
6194
6195
6196
6197
6198
6199
6200
6201
6202
6203
6204
6205
6206
6207
6208
6209
6210
6211
6212
6213
6214
6215
6216
6217
6218
6219
6220
6221
6222
6223
6224
6225
6226
6227
6228
6229
6230
6231
6232
6233
6234
6235
6236
6237
6238
6239
6240
6241
6242
6243
6244
6245
6246
6247
6248
6249
6250
6251
6252
6253
6254
6255
6256
6257
6258
6259
6260
6261
6262
6263
6264
6265
6266
6267
6268
6269
6270
6271
6272
6273
6274
6275
6276
6277
6278
6279
6280
6281
6282
6283
6284
6285
6286
6287
6288
6289
6290
6291
6292
6293
6294
6295
6296
6297
6298
6299
6300
6301
6302
6303
6304
6305
6306
6307
6308
6309
6310
6311
6312
6313
6314
6315
6316
6317
6318
6319
6320
6321
6322
6323
6324
6325
6326
6327
6328
6329
6330
6331
6332
6333
6334
6335
6336
6337
6338
6339
6340
6341
6342
6343
6344
6345
6346
6347
6348
6349
6350
6351
6352
6353
6354
6355
6356
6357
6358
6359
6360
6361
6362
6363
6364
6365
6366
6367
6368
6369
6370
6371
6372
6373
6374
6375
6376
6377
6378
6379
6380
6381
6382
6383
6384
6385
6386
6387
6388
6389
6390
6391
6392
6393
6394
6395
6396
6397
6398
6399
6400
6401
6402
6403
6404
6405
6406
6407
6408
6409
6410
6411
6412
6413
6414
6415
6416
6417
6418
6419
6420
6421
6422
6423
6424
6425
6426
6427
6428
6429
6430
6431
6432
6433
6434
6435
6436
6437
6438
6439
6440
6441
6442
6443
6444
6445
6446
6447
6448
6449
6450
6451
6452
6453
6454
6455
6456
6457
6458
6459
6460
6461
6462
6463
6464
6465
6466
6467
6468
6469
6470
6471
6472
6473
6474
6475
6476
6477
6478
6479
6480
6481
6482
6483
6484
6485
6486
6487
6488
6489
6490
6491
6492
6493
6494
6495
6496
6497
6498
6499
6500
6501
6502
6503
6504
6505
6506
6507
6508
6509
6510
6511
6512
6513
6514
6515
6516
6517
6518
6519
6520
6521
6522
6523
6524
6525
6526
6527
6528
6529
6530
6531
6532
6533
6534
6535
6536
6537
6538
6539
6540
6541
6542
6543
6544
6545
6546
6547
6548
6549
6550
6551
6552
6553
6554
6555
6556
6557
6558
6559
6560
6561
6562
6563
6564
6565
6566
6567
6568
6569
6570
6571
6572
6573
6574
6575
6576
6577
6578
6579
6580
6581
6582
6583
6584
6585
6586
6587
6588
6589
6590
6591
6592
6593
6594
6595
6596
6597
6598
6599
6600
6601
6602
6603
6604
6605
6606
6607
6608
6609
6610
6611
6612
6613
6614
6615
6616
6617
6618
6619
6620
6621
6622
6623
6624
6625
6626
6627
6628
6629
6630
6631
6632
6633
6634
6635
6636
6637
6638
6639
6640
6641
6642
6643
6644
6645
6646
6647
6648
6649
6650
6651
6652
6653
6654
6655
6656
6657
6658
6659
6660
6661
6662
6663
6664
6665
6666
6667
6668
6669
6670
6671
6672
6673
6674
6675
6676
6677
6678
6679
6680
6681
6682
6683
6684
6685
6686
6687
6688
6689
6690
6691
6692
6693
6694
6695
6696
6697
6698
6699
6700
6701
6702
6703
6704
6705
6706
6707
6708
6709
6710
6711
6712
6713
6714
6715
6716
6717
6718
6719
6720
6721
6722
6723
6724
6725
6726
6727
6728
6729
6730
6731
6732
6733
6734
6735
6736
6737
6738
6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
6749
6750
6751
6752
6753
6754
6755
6756
6757
6758
6759
6760
6761
6762
6763
6764
6765
6766
6767
6768
6769
6770
6771
6772
6773
6774
6775
6776
6777
6778
6779
6780
6781
6782
6783
6784
6785
6786
6787
6788
6789
6790
6791
6792
6793
6794
6795
6796
6797
6798
6799
6800
6801
6802
6803
6804
6805
6806
6807
6808
6809
6810
6811
6812
6813
6814
6815
6816
6817
6818
6819
6820
6821
6822
6823
6824
6825
6826
6827
6828
6829
6830
6831
6832
6833
6834
6835
6836
6837
6838
6839
6840
6841
6842
6843
6844
6845
6846
6847
6848
6849
6850
6851
6852
6853
6854
6855
6856
6857
6858
6859
6860
6861
6862
6863
6864
6865
6866
6867
6868
6869
6870
6871
6872
6873
6874
6875
6876
6877
6878
6879
6880
6881
6882
6883
6884
6885
6886
6887
6888
6889
6890
6891
6892
6893
6894
6895
6896
6897
6898
6899
6900
6901
6902
6903
6904
6905
6906
6907
6908
6909
6910
6911
6912
6913
6914
6915
6916
6917
6918
6919
6920
6921
6922
6923
6924
6925
6926
6927
6928
6929
6930
6931
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
6947
6948
6949
6950
6951
6952
6953
6954
6955
6956
6957
6958
6959
6960
6961
6962
6963
6964
6965
6966
6967
6968
6969
6970
6971
6972
6973
6974
6975
6976
6977
6978
6979
6980
6981
6982
6983
6984
6985
6986
6987
6988
6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
7002
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
7023
7024
7025
7026
7027
7028
7029
7030
7031
7032
7033
7034
7035
7036
7037
7038
7039
7040
7041
7042
7043
7044
7045
7046
7047
7048
7049
7050
7051
7052
7053
7054
7055
7056
7057
7058
7059
7060
7061
7062
7063
7064
7065
7066
7067
7068
7069
7070
7071
7072
7073
7074
7075
7076
7077
7078
7079
7080
7081
7082
7083
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103
7104
7105
7106
7107
7108
7109
7110
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
7126
7127
7128
7129
7130
7131
7132
7133
7134
7135
7136
7137
7138
7139
7140
7141
7142
7143
7144
7145
7146
7147
7148
7149
7150
7151
7152
7153
7154
7155
7156
7157
7158
7159
7160
7161
7162
7163
7164
7165
7166
7167
7168
7169
7170
7171
7172
7173
7174
7175
7176
7177
7178
7179
7180
7181
7182
7183
7184
7185
7186
7187
7188
7189
7190
7191
7192
7193
7194
7195
7196
7197
7198
7199
7200
7201
7202
7203
7204
7205
7206
7207
7208
7209
7210
7211
7212
7213
7214
7215
7216
7217
7218
7219
7220
7221
7222
7223
7224
7225
7226
7227
7228
7229
7230
7231
7232
7233
7234
7235
7236
7237
7238
7239
7240
7241
7242
7243
7244
7245
7246
7247
7248
7249
7250
7251
7252
7253
7254
7255
7256
7257
7258
7259
7260
7261
7262
7263
7264
7265
7266
7267
7268
7269
7270
7271
7272
7273
7274
7275
7276
7277
7278
7279
7280
7281
7282
7283
7284
7285
7286
7287
7288
7289
7290
7291
7292
7293
7294
7295
7296
7297
7298
7299
7300
7301
7302
7303
7304
7305
7306
7307
7308
7309
7310
7311
7312
7313
7314
7315
7316
7317
7318
7319
7320
7321
7322
7323
7324
7325
7326
7327
7328
7329
7330
7331
7332
7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
7345
7346
7347
7348
7349
7350
7351
7352
7353
7354
7355
7356
7357
7358
7359
7360
7361
7362
7363
7364
7365
7366
7367
7368
7369
7370
7371
7372
7373
7374
7375
7376
7377
7378
7379
7380
7381
7382
7383
7384
7385
7386
7387
7388
7389
7390
7391
7392
7393
7394
7395
7396
7397
7398
7399
7400
7401
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7415
7416
7417
7418
7419
7420
7421
7422
7423
7424
7425
7426
7427
7428
7429
7430
7431
7432
7433
7434
7435
7436
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7449
7450
7451
7452
7453
7454
7455
7456
7457
7458
7459
7460
7461
7462
7463
7464
7465
7466
7467
7468
7469
7470
7471
7472
7473
7474
7475
7476
7477
7478
7479
7480
7481
7482
7483
7484
7485
7486
7487
7488
7489
7490
7491
7492
7493
7494
7495
7496
7497
7498
7499
7500
7501
7502
7503
7504
7505
7506
7507
7508
7509
7510
7511
7512
7513
7514
7515
7516
7517
7518
7519
7520
7521
7522
7523
7524
7525
7526
7527
7528
7529
7530
7531
7532
7533
7534
7535
7536
7537
7538
7539
7540
7541
7542
7543
7544
7545
7546
7547
7548
7549
7550
7551
7552
7553
7554
7555
7556
7557
7558
7559
7560
7561
7562
7563
7564
7565
7566
7567
7568
7569
7570
7571
7572
7573
7574
7575
7576
7577
7578
7579
7580
7581
7582
7583
7584
7585
7586
7587
7588
7589
7590
7591
7592
7593
7594
7595
7596
7597
7598
7599
7600
7601
7602
7603
7604
7605
7606
7607
7608
7609
7610
7611
7612
7613
7614
7615
7616
7617
7618
7619
7620
7621
7622
7623
7624
7625
7626
7627
7628
7629
7630
7631
7632
7633
7634
7635
7636
7637
7638
7639
7640
7641
7642
7643
7644
7645
7646
7647
7648
7649
7650
7651
7652
7653
7654
7655
7656
7657
7658
7659
7660
7661
7662
7663
7664
7665
7666
7667
7668
7669
7670
7671
7672
7673
7674
7675
7676
7677
7678
7679
7680
7681
7682
7683
7684
7685
7686
7687
7688
7689
7690
7691
7692
7693
7694
7695
7696
7697
7698
7699
7700
7701
7702
7703
7704
7705
7706
7707
7708
7709
7710
7711
7712
7713
7714
7715
7716
7717
7718
7719
7720
7721
7722
7723
7724
7725
7726
7727
7728
7729
7730
7731
7732
7733
7734
7735
7736
7737
7738
7739
7740
7741
7742
7743
7744
7745
7746
7747
7748
7749
7750
7751
7752
7753
7754
7755
7756
7757
7758
7759
7760
7761
7762
7763
7764
7765
7766
7767
7768
7769
7770
7771
7772
7773
7774
7775
7776
7777
7778
7779
7780
7781
7782
7783
7784
7785
7786
7787
7788
7789
7790
7791
7792
7793
7794
7795
7796
7797
7798
7799
7800
7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
7814
7815
7816
7817
7818
7819
7820
7821
7822
7823
7824
7825
7826
7827
7828
7829
7830
7831
7832
7833
7834
7835
7836
7837
7838
7839
7840
7841
7842
7843
7844
7845
7846
7847
7848
7849
7850
7851
7852
7853
7854
7855
7856
7857
7858
7859
7860
7861
7862
7863
7864
7865
7866
7867
7868
7869
7870
7871
7872
7873
7874
7875
7876
7877
7878
7879
7880
7881
7882
7883
7884
7885
7886
7887
7888
7889
7890
7891
7892
7893
7894
7895
7896
7897
7898
7899
7900
7901
7902
7903
7904
7905
7906
7907
7908
7909
7910
7911
7912
7913
7914
7915
7916
7917
7918
7919
7920
7921
7922
7923
7924
7925
7926
7927
7928
7929
7930
7931
7932
7933
7934
7935
7936
7937
7938
7939
7940
7941
7942
7943
7944
7945
7946
7947
7948
7949
7950
7951
7952
7953
7954
7955
7956
7957
7958
7959
7960
7961
7962
7963
7964
7965
7966
7967
7968
7969
7970
7971
7972
7973
7974
7975
7976
7977
7978
7979
7980
7981
7982
7983
7984
7985
7986
7987
7988
7989
7990
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
8006
8007
8008
8009
8010
8011
8012
8013
8014
8015
8016
8017
8018
8019
8020
8021
8022
8023
8024
8025
8026
8027
8028
8029
8030
8031
8032
8033
8034
8035
8036
8037
8038
8039
8040
8041
8042
8043
8044
8045
8046
8047
8048
8049
8050
8051
8052
8053
8054
8055
8056
8057
8058
8059
8060
8061
8062
8063
8064
8065
8066
8067
8068
8069
8070
8071
8072
8073
8074
8075
8076
8077
8078
8079
8080
8081
8082
8083
8084
8085
8086
8087
8088
8089
8090
8091
8092
8093
8094
8095
8096
8097
8098
8099
8100
8101
8102
8103
8104
8105
8106
8107
8108
8109
8110
8111
8112
8113
8114
8115
8116
8117
8118
8119
8120
8121
8122
8123
8124
8125
8126
8127
8128
8129
8130
8131
8132
8133
8134
8135
8136
8137
8138
8139
8140
8141
8142
8143
8144
8145
8146
8147
8148
8149
8150
8151
8152
8153
8154
8155
8156
8157
8158
8159
8160
8161
8162
8163
8164
8165
8166
8167
8168
8169
8170
8171
8172
8173
8174
8175
8176
8177
8178
8179
8180
8181
8182
8183
8184
8185
8186
8187
8188
8189
8190
8191
8192
8193
8194
8195
8196
8197
8198
8199
8200
8201
8202
8203
8204
8205
8206
8207
8208
8209
8210
8211
8212
8213
8214
8215
8216
8217
8218
8219
8220
8221
8222
8223
8224
8225
8226
8227
8228
8229
8230
8231
8232
8233
8234
8235
8236
8237
8238
8239
8240
8241
8242
8243
8244
8245
8246
8247
8248
8249
8250
8251
8252
8253
8254
8255
8256
8257
8258
8259
8260
8261
8262
8263
8264
8265
8266
8267
8268
8269
8270
8271
8272
8273
8274
8275
8276
8277
8278
8279
8280
8281
8282
8283
8284
8285
8286
8287
8288
8289
8290
8291
8292
8293
8294
8295
8296
8297
8298
8299
8300
8301
8302
8303
8304
8305
8306
8307
8308
8309
8310
8311
8312
8313
8314
8315
8316
8317
8318
8319
8320
8321
8322
8323
<?xml version="1.0" encoding="UTF-8"?>



aptitude user's manual


Version 0.8.10


Daniel Burrows

Main author of the document. <dburrows@debian.org>


Manuel A. Fernandez Montecelo

Main maintainer after Daniel Burrows, documentation about new features,
corrections and formatting. <mafm@debian.org>

Copyright © 2004-2011, 2012-2016 Daniel Burrows, Manuel A. Fernandez Montecelo

This manual is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This manual is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this manual; if not, write to the Free Software Foundation, Inc., 51 Franklin
St, Fifth Floor, Boston, MA 02110-1301 USA

--------------------------------------------------------------------------------
Table of Contents



  Introduction


        What is this aptitude thing, anyway?

        What is a package manager?

        What is the apt system?

        How can I get aptitude?


              Pre-built aptitude packages, or, “what 99% of users should do”

              Building aptitude from source code

              Tracking and participating in aptitude development



  1. Getting started


        Using aptitude


              aptitude basics

              Navigating the aptitude package list

              Finding packages by name

              Managing packages

              Updating the package list and installing packages


        Using aptitude from the command line


  2. aptitude reference guide


        The aptitude terminal user interface


              Using the menus

              Menu commands

              Working with multiple views

              Becoming root


        Managing packages


              Managing the package list

              Accessing package information

              Modifying package states

              Downloading, installing, and removing packages

              Understanding and managing package trust

              Managing automatically installed packages


        Resolving package dependencies


              Dependency resolution in aptitude

              Immediate dependency resolution

              Resolving Dependencies Interactively

              Costs in the interactive dependency resolver

              Configuring the interactive dependency resolver


        Search patterns


              Searching for strings

              Shorthand for search terms

              Searches and versions

              Explicit search targets

              Search term reference


        Customizing aptitude


              Customizing the package list

              Customizing keybindings

              Customizing text colors and styles

              Customizing the display layout

              Configuration file reference

              Themes


        Playing Minesweeper


  3. aptitude frequently asked questions

  4. Credits

  I. Command-line reference


        aptitude — high-level interface to the package manager

        aptitude-create-state-bundle — bundle the current aptitude state

        aptitude-run-state-bundle — unpack an aptitude state bundle and invoke
        aptitude on it


List of Figures



  2.1. Commands available in the Actions menu

  2.2. Commands available in the Undo menu

  2.3. Commands available in the Package menu

  2.4. Commands available in the Resolver menu

  2.5. Commands available in the Search menu

  2.6. Commands available in the Options menu

  2.7. Commands available in the Views menu

  2.8. Commands available in the Help menu

  2.9. Values of the “current state” flag

  2.10. Values of the “action” flag

  2.11. Syntax of compound cost components

  2.12. Safety cost levels

  2.13. Syntax of the ?for term

  2.14. Customizable styles in aptitude

List of Tables



  2.1. Basic cost components

  2.2. Default safety cost levels

  2.3. Quick guide to search terms

List of Examples



  2.1. Sample resolver costs

  2.2. Use of the ?= term.

  2.3. Use of the ?bind term

  2.4. Use of the ?exact-name term

  2.5. Use of the ?for term

  2.6. Use of the ?term-prefix term

  2.7. Grouping policy firstchar or firstchar(binary)

  2.8. Grouping policy firstchar(source)

  2.9. Use of pattern to group packages by their maintainer

  2.10. Use of pattern with some packages placed at the top level

  2.11. Use of the pattern grouping policy with sub-policies

  12. Usage of --show-summary



Introduction

Table of Contents



  What is this aptitude thing, anyway?

  What is a package manager?

  What is the apt system?

  How can I get aptitude?


        Pre-built aptitude packages, or, “what 99% of users should do”

        Building aptitude from source code

        Tracking and participating in aptitude development



  “Master, does Emacs possess the Buddha nature?” the novice asked.              

   “I don't see why not,” replied the master. “It's got bloody well everything
   else.” Several years later, the novice suddenly achieved enlightenment.

                                                                         -- John Fouhy


Hello, and welcome to the aptitude user's manual! This introductory section
explains what aptitude is and how to get your hands on it; for information on
actually using it, please proceed to Chapter 1, Getting started.


What is this aptitude thing, anyway?

aptitude is a featureful package manager for Debian GNU/Linux systems, based on
the renowned apt package management infrastructure. aptitude provides the
functionality of dselect and apt-get, as well as many additional features not
found in either program.


What is a package manager?

A package manager keeps track of what software is installed on your computer,
and allows you to easily install new software, upgrade software to newer
versions, or remove software that you previously installed. As the name
suggests, package managers deal with packages: collections of files that are
bundled together and can be installed and removed as a group.

Often, a package is just a particular program. For instance, the instant
messaging client gaim is contained in the Debian package of the same name. On
the other hand, it is common for programs to consist of several interrelated
packages. For instance, the gimp image editor consists not only of the gimp
package, but also of the gimp-data package; in addition, several optional add-on
packages (containing esoteric data, documentation, and so on) are also
available. It is also possible for several small, related programs to be
contained in a single package: for instance, the fileutils package contains
several common Unix commands, such as ls, cp, etc.

Some packages require other packages in order to function. In Debian, packages
can depend upon, recommend, suggest, break, or conflict with other packages.


* If a package A depends upon another package B, then B is required for A to
  operate properly. For instance, the gimp package depends upon the gimp-data
  package in order to ensure that the GIMP graphics editor can access its
  critical data files.

* If a package A recommends another package B, then B provides important
  additional functionality to A that will be desired in most circumstances. For
  instance, the mozilla-browser package recommends the mozilla-psm package,
  which adds support for secure data transfers to the Mozilla Web browser. While
  mozilla-psm is not strictly required for Mozilla to function, most users will
  want Mozilla to support the secure transmission of confidential data (such as
  credit card numbers).

* If a package A suggests another package B, then package B provides
  functionality that may enhance A, but is not needed in most cases. For
  instance, the kmail package suggests the gnupg package, which contains
  encryption software that can be used by KMail.

* If a package A conflicts with another package B, then the two packages cannot
  be installed at the same time. For instance, fb-music-hi conflicts with fb-
  music-low because they provide alternate sets of music for the game Frozen
  Bubble.


The job of a package manager is to present an interface which assists the user
in managing the collection of packages installed on his or her system. aptitude
provides such an interface by building on the apt package management system.


What is the apt system?

Being able to install and remove packages is great, but the basic software for
doing this (known as dpkg) does exactly that and nothing more. This is fine if
you download one or two packages by hand, but quickly becomes cumbersome when
you are trying to manage a large number of packages. Furthermore, if your shiny
new package requires software you haven't yet installed, you have to download
the newly required software by hand. And if you later decide to remove the no-
longer-shiny package, these extra packages will linger on your system, consuming
hard drive space, unless you manually remove them.

Obviously, all of this manual labor is a tedious chore, and so most package
management systems come with software which takes care of some or all of it for
you. apt is a common base on which to build these programs: in addition to
aptitude, programs such as synaptic and apt-watch make use of apt.

apt works by keeping a list of the packages that can be downloaded from Debian
on your computer. This list is used to find packages that need to be upgraded
and to install new packages. apt can also solve many dependency problems
automatically: for instance, when you choose to install a package, it will find
any additional required packages and install those as well.

When working with a package manager based on apt, such as aptitude, you will
typically perform three basic tasks: you will update the list of packages that
are available by downloading new lists from the Debian servers, you will select
which packages should be installed, upgraded, or removed, and finally, you will
commit your selections by actually performing the installations, removals, etc.

apt-based package managers read the list of “sources” -- repositories of Debian
packages -- from the file /etc/apt/sources.list. The format and contents of this
file are beyond the scope of this document, but are described in the manual page
sources.list(5).


 How can I get aptitude?

In case you are reading this manual but aptitude is not yet installed on your
system, this section explains how to correct this unfortunate situation. Most
people should head straight for the section on binary packages.


Pre-built aptitude packages, or, “what 99% of users should do”

Pre-built, or “binary” packages are the easiest and most common way to install
aptitude. You should only attempt a source install if binary packages are not
available for some reason, or if you have unusual needs that are not met by
binary packages.

If you are using a Debian system, execute the following command as root: apt-get
install aptitude. If you are not using a Debian system, your system provider
might have created a pre-built package of aptitude; if you are not sure, you can
contact them for further suggestions.


Building aptitude from source code

You also can build aptitude from source; however, this is probably not a useful
exercise unless apt is already available on your system. If it is, you can
install aptitude from source with the following steps:


  1. Install the following pieces of software:


     o A C++ compiler, such as g++.

     o The development files for apt, typically available in a package with a
       name like libapt-pkg-dev.

     o The libsigc++-2.0 library, available in the package libsigc++-2.0-dev or
       from http://libsigc.sourceforge.net.

     o The cwidget library, available in the package libcwidget-dev or from
       http://cwidget.alioth.debian.org.

     o The gettext program, which should be included with your Linux
       distribution.

     o A make tool, such as GNU make.


  2. Last but not least, download the most recent aptitude source code,
     available from http://packages.debian.org/unstable/admin/aptitude. (scroll
     to the bottom of the page and download the “.orig.tar.gz” file)


Once all the required components are available, open a terminal and execute the
command tar zxf aptitude-0.8.10.tar.gz to unpack the source code. Once the
source code is unpacked, type cd aptitude-0.8.10 && ./configure && make to
compile aptitude. If this succeeds, make sure you are the root user (by using
su, for instance), then type make install to install aptitude on your computer.
Once aptitude is successfully installed, typing aptitude at a command prompt
should start the program.


Tracking and participating in aptitude development


Getting the aptitude development source tree

If you want to test the latest bleeding-edge source code for aptitude, you can
download unreleased aptitude source code using Git. Install Git (available from
http://git-scm.com/) and execute the command git clone git://anonscm.debian.org/
aptitude/aptitude.git to retrieve the most recent source code.


IMG.alt.suffix = \[Warning]] Warning

                             The aptitude Git repository is an active
                             development tree; it will change as bugs are fixed
                             and features are added, and there is absolutely no
                             guarantee that it will even compile, let alone run
                             properly! Bug reports are welcome, but be aware
                             that you use development code entirely at your own
                             risk![1]



Mailing list

The primary mailing list for aptitude development is <aptitude-
devel@lists.alioth.debian.org>. Archives of the list are located at http://
lists.alioth.debian.org/pipermail/aptitude-devel/. To subscribe, visit the Web
page http://lists.alioth.debian.org/mailman/listinfo/aptitude-devel.


Submitting patches

Ideally, patches should be submitted to the aptitude mailing list, <aptitude-
devel@lists.alioth.debian.org>. But if you prefer sending them by private email,
you may email them to <aptitude@packages.debian.org> or <dburrows@debian.org>. A
brief description of the motivation behind your patch, and an explanation of how
it works, are greatly appreciated.


Tracking changes to the aptitude source tree

The aptitude source tree is regularly updated with new features, bugfixes, and
new bugs. Once the source code is available on your computer (see the previous
section), you can cd into it and type git pull to update it with any changes
made to the main repository.

To automatically receive notifications when changes are made to the aptitude
codebase, subscribe to the Atom feed available at http://anonscm.debian.org/
gitweb/?p=aptitude/aptitude.git;a=atom or RSS feed available at http://
anonscm.debian.org/gitweb/?p=aptitude/aptitude.git;a=rss.


Building aptitude from the development tree

To build aptitude from the Git repository, you must have the programs autoconf
and automake installed. Type sh ./autogen.sh && ./configure to generate the
files needed to compile aptitude, then execute make and make install.



--------------------------------------------------------------------------------
[1]Of course, all free software is used at your own risk, but the risk involved
in using an active development tree is much higher.



Chapter 1. Getting started

Table of Contents



  Using aptitude


        aptitude basics

        Navigating the aptitude package list

        Finding packages by name

        Managing packages

        Updating the package list and installing packages


  Using aptitude from the command line


  A journey of a thousand miles must begin with a single step.  

                                                       -- Lao Tsu


aptitude is a sizeable program with many features, and it can be a bit
overwhelming for new users to get acquainted with it. This chapter does not
exhaustively describe the features of aptitude (see Chapter 2, aptitude
reference guide for that), but it does provide a walk-through of the basic and
most commonly used features of the program.


Using aptitude

This section describes how to use the visual interface of aptitude. For
information on using aptitude's command-line interface, see the section called
“Using aptitude from the command line”.


aptitude basics

To run aptitude, open your favorite text terminal, and at the command line,
type:

foobar$ aptitude

Once the cache is loaded (this may take some time on slower machines), the main
aptitude screen should appear:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--- Installed Packages
--- Not Installed Packages
--- Obsolete and Locally Created Packages
--- Virtual Packages
--- Tasks






These packages are currently installed on your computer.








As you can see, the main screen of aptitude is divided into several regions. The
blue line at the top of the terminal is the menu bar, and the blue lines below
it are informational messages describing some important commands. The black
space that follows is the list of all available packages, in which some groups
of packages are listed. The currently selected group (“Installed Packages”) is
highlighted, and its description is shown in the lower black space.

As the top line of the screen suggests, you can access aptitude's menus by
pressing Control+t (also valid: Control+Space and F10); you can also click the
mouse on a menu title if your system supports it. Pressing Control+t will open
the Actions menu:

 Actions  Undo  Package  Search  Options  Views  Help
+-------------------------+  u: Update  g: Download/Install/Remove Pkgs
|Install/remove packages g|
|Update package list     u|
|Forget new packages     f|
|Clean package cache      |eated Packages
|Clean obsolete files     |
|Mark Upgradable         U|
|Play Minesweeper         |
|Become root              |
+-------------------------+
|Quit                    Q|
+-------------------------+
These packages are currently installed on your computer.









Perform all pending installs and removals

Use the arrow keys and Enter to select menu items (or, if your system supports
it, click on them with a mouse); to close the menu without selecting anything,
press Control+t again. The currently highlighted menu item is explained at the
bottom of the screen. If a menu item can be activated using a keyboard shortcut,
the shortcut is displayed in the menu: for instance, the command “Update package
list” can be activated by pressing u.

At any time, you can press ? to display an on-line reference to the available
keyboard shortcuts.


Navigating the aptitude package list

The list of packages is the primary interface to aptitude. When aptitude starts,
the list is organized into a number of groups, as can be seen in the following
screen shot:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--- Installed Packages
--- Not Installed Packages
--- Obsolete and Locally Created Packages
--- Virtual Packages
--- Tasks






These packages are currently installed on your computer.









IMG.alt.suffix = \[Note]] Note

                          Empty groups of packages are automatically hidden by
                          aptitude, so you may see more or less groups than
                          appear in this screen shot.


In the screen shot above, the first group (“Installed Packages”) is highlighted
to indicate that it is currently selected. You can move the selection up and
down with the arrow keys; note that the description below the package list
changes as you do so. To “expand” a group, press Enter while the group is
selected:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--\ Installed Packages
  --- admin - Administrative utilities (install software, manage users, etc)
  --- base - The Debian base system
  --- devel - Utilities and programs for software development
  --- doc - Documentation and specialized programs for viewing documentation
  --- editors - Text editors and word processors
  --- electronics - Programs for working with circuits and electronics
  --- games - Games, toys, and fun programs
  --- gnome - The GNOME Desktop System
  --- graphics - Utilities to create, view, and edit graphics files

These packages are currently installed on your computer.








As you can see, the “Installed Packages” group has been expanded to reveal its
contents: it contains a number of subgroups, loosely defined by what types of
software they contain. Expanding the “admin” section by selecting it and
pressing Enter, we see:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--\ Installed Packages
  --\ admin - Administrative utilities (install software, manage users, etc)
    --- main - The main Debian archive
  --- base - The Debian base system
  --- devel - Utilities and programs for software development
  --- doc - Documentation and specialized programs for viewing documentation
  --- editors - Text editors and word processors
  --- electronics - Programs for working with circuits and electronics
  --- games - Games, toys, and fun programs
  --- gnome - The GNOME Desktop System

Packages in the 'admin' section allow you to perform administrative tasks such
as installing software, managing users, configuring and monitoring your system,
examining network traffic, and so on.






The “admin” group contains a single subgroup, the “main” Debian archive.
Expanding this group reveals some packages!


IMG.alt.suffix Tip
  = \[Tip]]
               To save time, you can use the [ key to expand all the subgroups of a group at
               once. Selecting “Installed Packages” and pressing [ would have immediately
               revealed the packages in the screenshot below.


 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--\ Installed Packages
  --\ admin - Administrative utilities (install software, manage users, etc)
    --\ main - The main Debian archive
i     acpid                                                1.0.3-19   1.0.3-19
i     alien                                                8.44       8.44
i     anacron                                              2.3-9      2.3-9
i     apt-show-versions                                    0.07       0.07
i A   apt-utils                                            0.5.25     0.5.25
i     apt-watch                                            0.3.2-2    0.3.2-2
i     aptitude                                             0.2.14.1-2 0.2.14.1-2

The Debian distribution consists of packages from the 'main' section. Every
package in 'main' is Free Software.

For more information about what Debian considers to be Free Software, see
http://www.debian.org/social_contract#guidelines




In addition to the arrow keys, you can move the selection through the package
list by a page of information at a time using the Page Up and Page Down keys.


IMG.alt.suffix = \[Tip]] Tip

                         When there is more information in the lower half of the
                         display than fits into the available space, the a and z
                         keys can be used to scroll through it.



Finding packages by name

To quickly find a package whose name you know, press / to open a search dialog:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
i     frozen-bubble                                        1.0.0-5    1.0.0-5
i A   frozen-bubble-data                                   1.0.0-5    1.0.0-5
i     geekcode                                             1.7.3-1    1.7.3-1
i     gfpoken                                              0.25-3     0.25-3
i     ggz-gnome-client                                     0.0.7-2    0.0.7-2
i     ggz-gtk-client                                       0.0.7-1    0.0.7-1
i     ggz-gtk-game-data                                    0.0.7-2    0.0.7-2
i +--------------------------------------------------------------------------+
i |Search for:                                                               |
i |froz                                                                      |
Po|                             [ Ok ]                             [ Cancel ]|
Fr+--------------------------------------------------------------------------+
attempt to shoot bubbles into groups of the same color to cause them to pop. It
features 100 single-player levels, a two-player mode, music and striking
graphics.

This game is widely rumored to be responsible for delaying the Woody release.

URL: http://www.frozen-bubble.org/

As you can see in the above screen shot, a search for froz finds the frozen-
bubble package. Using aptitude's powerful search language, described in the
section called “Search patterns”, it is possible to find packages based on many
complex criteria.


IMG.alt.suffix = \[Tip]] Tip

                         You can search backwards in the package list by
                         pressing \, and you can repeat the last search by
                         pressing n after closing the search window.


Sometimes it is useful to hide all packages except those which meet some
particular criterion. To do this, press l:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--- Installed Packages
--- Not Installed Packages
--- Obsolete and Locally Created Packages
--- Virtual Packages
--- Tasks


  +--------------------------------------------------------------------------+
  |Enter the new package tree limit:                                         |
  |apti                                                                      |
  |                             [ Ok ]                             [ Cancel ]|
Th+--------------------------------------------------------------------------+ a








This dialog works exactly like the search dialog, except that instead of
highlighting the next package that matches what you typed into the dialog box,
it hides all packages which don't match. For instance, typing apti into this
dialog box and pressing Enter will hide all packages except those whose names
contain “apti”:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--\ Installed Packages
  --\ admin - Administrative utilities (install software, manage users, etc)
    --\ main - The main Debian archive
i     aptitude                                             0.2.14.1-2 0.2.14.1-2
i A   synaptic                                             0.51-1     0.51-1
  --\ x11 - The X window system and related software
    --\ main - The main Debian archive
i     xfree86-driver-synaptics                             0.13.3-1   0.13.3-1
--- Not Installed Packages
--- Virtual Packages

These packages are currently installed on your computer.









Managing packages

Now that you can move about the list of packages, it's time to start using
aptitude to install and remove packages. In this section you will learn how to
flag packages for installation, deletion, and upgrade.


IMG.alt.suffix = \[Tip]] Tip

                         You can only change your system's setup as the root
                         user. If you want to experiment with aptitude, you can
                         safely run it as any user other than root without
                         damaging your system in any way. aptitude will tell you
                         when you try to do something that only root can do, and
                         if you want to continue, you must type root's password.


All changes to a package are performed by first highlighting it in the package
list, then pressing a key corresponding to the action which should be performed.
The basic action keys [2] are + to install or upgrade a package, - to remove a
package, and = to prevent a package from being automatically upgraded (this is
known as holding the package). These actions are not performed immediately;
aptitude will simply update the package list to show the change that has been
requested.

For instance, in the screen shot below, the kaffeine-mozilla package was
selected and + was pushed. The package is now highlighted in green and the
letter “i” has appeared to the left of its name, to indicate that it will be
installed; in addition, an estimate of the amount of space that the package will
use is displayed.

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1                  Will use 2925kB of disk space  DL Size:
1375kB
  --\ kde - The KDE Desktop System
    --\ main - The main Debian archive
p     bibletime-i18n                                        <none>     1.4.1-1
p     education-desktop-kde                                 <none>     0.771
p     junior-kde                                            <none>     1.4
piA   kaffeine                                      +2843kB <none>     0.4.3-1
pi    kaffeine-mozilla                              +81.9kB <none>     0.4.3-1
p     karamba                                               <none>     0.17-5
p     kde-devel                                             <none>     4:3.1.2

p     kde-devel-extras                                      <none>     4:3.1.2
The K Desktop Environment (development files)
A metapackage containing dependencies for the core development suite of KDE
including kdesdk, qt3-designer, and all core KDE -dev packages.








IMG.alt.suffix Tip
  = \[Tip]]
               At any time, you can use Undo → Undo (Control+u) to “undo” any change to one or more
               packages. This is very useful if an action has unforeseen consequences and you want
               to “take it back”.


In addition to actions that affect individual packages, another important action
is available: typing U will attempt to upgrade any packages that can be
upgraded. You should use this command on a regular basis to keep your system up-
to-date.


Managing broken packages

Sometimes, changing a package's state will cause dependency relationships to
become unfulfilled; packages with unfulfilled dependencies are said to be
broken. aptitude will warn you when this happens, and explain why it occured.
For instance, here is what happens if I attempt to remove sound-juicer:

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.3.3       #Broken: 1   Will free 48.6MB of disk space
i A   nautilus                                             2.10.1-4   2.10.1-4
i     nautilus-cd-burner                                   2.10.2-1.1 2.10.2-1.1
i A   nautilus-data                                        2.10.1-4   2.10.1-4
i     netspeed                                             0.12.1-1   0.12.1-1
i A   oaf                                                  0.6.10-3   0.6.10-3
i     pybliographer                                        1.2.6.2-1  1.2.6.2-1
i     rhythmbox                                            0.8.8-13   0.8.8-13
i     shermans-aquarium                                    3.0.1-1    3.0.1-1
idA   sound-juicer                                 -1733kB 2.10.1-3   2.10.1-3
GNOME 2 CD Ripper
sound-juicer will be removed.


The following packages depend on sound-juicer and will be broken by its
removal:


  * gnome-desktop-environment depends on sound-juicer

[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

As you can see, aptitude displays three indicators that something has gone
wrong: first, the number of broken packages is displayed in the upper blue area;
second, the lower half of the display changes to describe broken packages that
are related to the currently highlighted package; third, a bar appears at the
bottom of the screen with a suggestion on how to solve the problem. To quickly
find broken packages in the package list, you can press b or search for ?broken.


IMG.alt.suffix Note
  = \[Note]]
               The text [1(1)/...] indicates the progress of aptitude's dependency resolver.
               The first number is the solution that you have currently selected, and the
               second one is the number of solutions that aptitude has already generated. The
               presence of the text “...” indicates that there may be additional solutions
               beyond the ones generated; if aptitude knew for certain that it had generated
               the only possible solution, this indicator would read [1/1].


To see more information about how aptitude thinks you can solve this problem,
press e. A screen similar to the following will appear:

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
    gstreamer0.8-cdparanoia                           [0.8.10-1 (unstable, now)]
    sound-juicer                                                [2.10.1-2 (now)]
















[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

From here, you can see more solutions by pressing . or return to solutions that
you previously examined by pressing ,. To apply the current solution and return
to the package list, press !. For instance, pressing . while the above screen is
displayed results in the following solution being presented:

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
    sound-juicer                                      [2.10.1-3 (unstable, now)]
  --\ Downgrade the following packages:
    gstreamer0.8-cdparanoia          [0.8.11-1 unstable, now -> 0.8.8-3 testing]















[2(2)/...] Suggest 1 keep,1 downgrade
e: Examine  !: Apply  .: Next  ,: Previous

In addition to the basic solution navigation commands, you can press r to
“reject” actions of which you disapprove. For instance, the first solution will
cancel the removal of sound-juicer -- the very action we were trying to perform!
By pressing r on the item corresponding to this action, we can tell aptitude
that it should not cancel the removal of sound-juicer in this way.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
    gstreamer0.8-cdparanoia                           [0.8.11-1 (unstable, now)]
R   sound-juicer                                      [2.10.1-3 (unstable, now)]






GNOME 2 CD Ripper
gnome-desktop-environment depends upon sound-juicer
--\ The following actions will resolve this dependency:
  -> Remove gnome-desktop-environment [1:2.10.2.3 (unstable, testing, now)]
R -> Cancel the removal of sound-juicer
  -> Downgrade sound-juicer [2.10.1-3 (unstable, now) -> 0.6.1-2 (testing)]




[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

As you can see, the list item corresponding to keeping sound-juicer at its
current version has turned red and been marked with an “R”, indicating that it
has been rejected. Solutions that you generate in the future (that is, any
solution that you have not yet viewed) will not include this action, although
solutions that were already generated and contain this action will be available.


IMG.alt.suffix = \[Note]] Note

                          In the above screen image, a description of sound-
                          juicer is displayed in the middle of the screen; below
                          it, you can see the dependency that caused sound-
                          juicer to be kept at its current version, along with
                          all the ways to resolve this dependency that aptitude
                          knows about.


For instance, if this rejection is imposed immediately after attempting to
remove sound-juicer, pressing . retrieves the following solution, skipping the
solution that cancels the installation of sound-juicer and downgrades
gstreamer0.8-cdparanoia.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Remove the following packages:
    gnome-desktop-environment              [1:2.10.2.3 (unstable, testing, now)]

















[2(2)/...] Suggest 1 removal
e: Examine  !: Apply  .: Next  ,: Previous

Rejections are only applied to newly generated solutions: that is, solutions
that are generated when you press . while viewing the last generated solution.
Previously generated solutions can still contain rejections. You can cancel a
rejection at any time by once again selecting the rejected action and pressing
r; this will permit solutions containing the action to be generated again,
including any solutions that were previously “skipped”.

The opposite of rejecting an action is approving it. To approve an action, just
select it and press a; this forces the problem resolver to choose the action
whenever possible[3]. Approved actions will turn green and will be marked with
“A”, as in the following screenshot:

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Remove the following packages:
A   gnome-desktop-environment              [1:2.10.2.3 (unstable, testing, now)]

















[2(2)/...] Suggest 1 removal
e: Examine  !: Apply  .: Next  ,: Previous


IMG.alt.suffix = \[Important]] Important

                               If you do not resolve any broken dependencies,
                               aptitude will automatically implement its current
                               suggestion when you commit your selections by
                               pressing g. However, it is hard to automatically
                               solve dependency problems, and you may not be
                               happy with the results, so it is generally better
                               to look at what aptitude plans to do before
                               committing your selections.



Updating the package list and installing packages

At this point, you know enough about aptitude to actually make modifications to
your system.

You should periodically update your list of available packages from the Debian
servers, to keep track of new packages and new versions of packages. To do this,
press u. At any time during the download, you can press q to abort it.

Once you have fresh lists of packages, you can choose the packages to upgrade,
install, or remove as described in the previous section. To review the actions
you have requested, press g once. When installing the kaffeine-mozilla package
(from the previous example), the following screen appears:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1                  Will use 2925kB of disk space  DL Size:
1375kB
--\ Packages being automatically installed to satisfy dependencies

piA kaffeine                                        +2843kB <none>     0.4.3-1
--\ Packages to be installed
pi  kaffeine-mozilla                                +81.9kB <none>     0.4.3-1







These packages are being installed because they are required by another package
you have chosen for installation.

If you select a package, an explanation of its current state will appear in this
space.




As you can see, aptitude automatically decided to install kaffeine for me
because kaffeine-mozilla requires it. At this point, I have the choice of either
continuing with the installation by pressing g, or aborting it by pressing q.


Using aptitude from the command line

In addition to its “visual” interface described in the previous section,
aptitude can be used to manage packages directly from the command-line in the
same way that you would use apt-get. This section covers the most common
aptitude command-line actions; for more information, see the aptitude command-
line reference.

In general, a command-line invocation of aptitude will look like this:

aptitude action [arguments...]

action tells aptitude what action it is to take; the remaining arguments are
used in an option-specific fashion. Typically they will consist of package names
and command-line switches[4].

The most important actions are:



  aptitude update

      This command updates the package lists, as if you had entered the visual
      interface and pressed u.


  aptitude safe-upgrade

      This command will upgrade as many packages as it can upgrade without
      removing existing packages.

      It is sometimes necessary to remove one package in order to upgrade
      another; this command is not able to upgrade packages in such situations.
      Use the full-upgrade command to upgrade those packages as well.


  aptitude full-upgrade

      Like safe-upgrade, this command will attempt to upgrade packages, but it
      is more aggressive about solving dependency problems: it will install and
      remove packages until all dependencies are satisfied. Because of the
      nature of this command, it is possible that it will do undesirable things,
      and so you should be careful when using it.


      IMG.alt.suffix = \[Note]] Note

                                For historical reasons, this command was
                                originally named dist-upgrade, and that name is
                                still recognized by aptitude.



  aptitude [ install | remove | purge ] pkg1 [pkg2...]

      These commands install, remove, or purge[5] the specified packages.
      “Installing” a package which is already installed but can be upgraded will
      cause it to be upgraded.


  aptitude search pattern1 [pattern2...]

      This command searches for packages whose name contains any of the given
      patterns, printing the result to the terminal. In addition to just being a
      string of text, each pattern can be a search pattern as described in the
      section called “Search patterns”. [6] For instance, “aptitude search gnome
      kde” will list all packages whose name contains either “gnome” or “kde”.


  aptitude show pkg1 [pkg2...]

      Prints information about each pkg to the terminal.


The commands that install, upgrade, and remove packages all accept the parameter
-s, which stands for “simulate”. When -s is passed on the command line, the
program performs all the actions it would normally perform, but does not
actually download or install/remove any files.

aptitude will sometimes present a prompt like this:

The following NEW packages will be automatically installed:
  space-orbit-common
The following NEW packages will be installed:
  space-orbit space-orbit-common
0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 3200kB of archives. After unpacking 8413kB will be used.
Do you want to continue? [Y/n/?]

In addition to the obvious options of “Yes” and “No”, a number of commands are
available which can be used to change the information displayed at the prompt,
or to specify further actions. For instance, typing s will display or hide
information about how much space each package will use:

Do you want to continue? [Y/n/?] s

Size changes will be shown.

The following NEW packages will be automatically installed:
  space-orbit-common <+8020kB>
The following NEW packages will be installed:
  space-orbit <+393kB> space-orbit-common <+8020kB>
0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 3200kB of archives. After unpacking 8413kB will be used.
Do you want to continue? [Y/n/?]

Similarly, typing d will display information about automatically installed or
removed packages:

The following NEW packages will be automatically installed:
  space-orbit-common (D: space-orbit)
The following NEW packages will be installed:
  space-orbit space-orbit-common
0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 3200kB of archives. After unpacking 8413kB will be used.

This shows that space-orbit-common is being installed because space-orbit
depends on it. You can see the entire list of possible entries by entering ? at
the prompt.

If your request violates dependencies in a way that cannot be trivially
resolved, aptitude will ask you what to do:

The following packages are BROKEN:
  libsdl1.2debian
The following packages will be REMOVED:
  libsdl1.2debian-alsa
.
.
.
The following actions will resolve these dependencies:

Install the following packages:
libsdl1.2debian-all [1.2.12-1 (unstable)]

Score is 41

Accept this solution? [Y/n/q/?]

Typing y (or simply pressing enter) will accept the proposed solution. Typing n
will display the “next best” solution:

Accept this solution? [Y/n/q/?] n
The following actions will resolve these dependencies:

Install the following packages:
libsdl1.2debian-esd [1.2.12-1 (unstable)]

Score is 19

Accept this solution? [Y/n/q/?]

As with the main command-line prompt, you can perform a number of additional
actions, including manually altering the states of packages, from the dependency
resolution prompt. Type ? to see a complete list.

Typing q will abort the automatic resolver and allow you to resolve the
dependencies manually:

Accept this solution? [Y/n/q/?] q
aptitude failed to find a solution to these dependencies.  You can solve them
yourself by hand or type 'n' to quit.
The following packages have unmet dependencies:
  libsdl1.2debian: Depends: libsdl1.2debian-alsa (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-all (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-esd (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-arts (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-oss (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-nas (= 1.2.12-1) but it is not
installable or
                            libsdl1.2debian-pulseaudio (= 1.2.12-1) but it is
not installable
Resolve these dependencies by hand? [N/+/-/_/:/?]

You can use any of the package manipulation commands to resolve the broken
dependencies (type ? for a full list of the available commands). Type n or press
enter to quit aptitude:

Resolve these dependencies by hand? [N/+/-/_/:/?] n
Abort.

For complete documentation of the command-line features of aptitude, see
Command-line reference.



--------------------------------------------------------------------------------
[2] You can also change packages using the Package menu; see the section called
“The Package menu” for details.

[3] Approving an action is slightly different from requiring all solutions to
contain the action; what it means is that given a choice between an approved
action and a non-approved action, the resolver will always pick the approved
action. If there are several possible approved actions, all of them will be
candidates to be placed into the solution.

[4]A “switch” is a letter preceded by a hyphen: for instance, “-a”, “-v”, etc.

[5]Purging a package removes the package, as well as all its configuration
files.

[6] In fact, the same is true of the commands that take packages as arguments,
such as install or show.



Chapter 2. aptitude reference guide

Table of Contents



  The aptitude terminal user interface


        Using the menus

        Menu commands

        Working with multiple views

        Becoming root


  Managing packages


        Managing the package list

        Accessing package information

        Modifying package states

        Downloading, installing, and removing packages

        Understanding and managing package trust

        Managing automatically installed packages


  Resolving package dependencies


        Dependency resolution in aptitude

        Immediate dependency resolution

        Resolving Dependencies Interactively

        Costs in the interactive dependency resolver

        Configuring the interactive dependency resolver


  Search patterns


        Searching for strings

        Shorthand for search terms

        Searches and versions

        Explicit search targets

        Search term reference


  Customizing aptitude


        Customizing the package list

        Customizing keybindings

        Customizing text colors and styles

        Customizing the display layout

        Configuration file reference

        Themes


  Playing Minesweeper


  The White Rabbit put on his spectacles. 'Where shall I begin, please your  
   Majesty?' he asked.

   'Begin at the beginning,' the King said gravely, 'and go on till you come
   to the end: then stop.'

                                          -- Lewis Carrol, Alice in Wonderland


aptitude is a large program with many features, and it is sometimes difficult to
remember how to do something, or even to remember whether that something is even
possible. Indeed, many feature requests received by the author describe features
which are already present but are difficult to find.[7]

In an attempt to combat this obscurity, this reference guide describes every
feature and configuration parameter of aptitude. For a more gentle guide to the
important features of aptitude, see Chapter 1, Getting started.


IMG.alt.suffix Note
  = \[Note]]
               aptitude's behavior and appearance can be configured in a number of
               ways. This manual describes how the program works with the default
               settings; descriptions of how various settings affect behavior are
               given in the section called “Customizing aptitude”.



The aptitude terminal user interface

This section describes the parts of the terminal-based user interface of
aptitude that do not deal with managing packages.


Using the menus

The menu bar at the top of the screen lists the most important commands in
aptitude. To activate the menu bar, press Control+t (also valid: Control+Space
and F10); you can then navigate it using the arrow keys and select a menu item
using Enter.

Some menu items also have “hotkeys”: letters or numbers that can be used to
select the item while the menu is active. These hotkeys are displayed in a
brighter shade of white than the rest of the menu.

In addition, some menu items have “shortcuts”: keystrokes that perform the same
action as the menu item while the menu is not active. These keystrokes are
listed on the right-hand side of the menu.

In the remainder of the manual, menu commands will be written like this: Menu →
Item (key). This indicates that you should choose Item from the Menu menu, and
that key is the shortcut for this command.


Menu commands


The Actions menu

Figure 2.1. Commands available in the Actions menu

 ______________________________________________________________________________________________________________________
|Command                                |Description                                                                   |
|_______________________________________|______________________________________________________________________________|
|                                       |If an installation preview is not visible, display one; otherwise, perform an |
|Actions → Install/remove packages (g)|install run as described in the section called “Downloading, installing, and|
|                                       |removing packages”.                                                         |
|_______________________________________|______________________________________________________________________________|
|Actions → Update package list (u)    |Bring the package list up-to-date.                                            |
|_______________________________________|______________________________________________________________________________|
|Actions → Mark Upgradable (U)        |Flag all upgradable packages, except those which are held or forbidden from   |
|                                       |upgrading, for upgrade.                                                       |
|_______________________________________|______________________________________________________________________________|
|Actions → Forget new packages (f)    |Discard all information about what packages are “new” (empty the “New   |
|                                       |Packages” tree).                                                            |
|_______________________________________|______________________________________________________________________________|
|                                       |Cancel all pending actions from this session (including installations,        |
|Actions → Cancel pending actions     |removals, upgrades, holds, marking as automatically installed...). This is    |
|                                       |roughly equivalent to restart the program.                                    |
|_______________________________________|______________________________________________________________________________|
|Actions → Clean package cache        |Delete all the compressed packages that were downloaded by aptitude [a].      |
|_______________________________________|______________________________________________________________________________|
|                                       |Delete any compressed packages that were downloaded by aptitude [a] and are no|
|Actions → Clean obsolete files       |longer available. These are presumed to be packages which are obsolete, and   |
|                                       |can be deleted to save disk space without requiring an otherwise unnecessary  |
|                                       |download.                                                                     |
|_______________________________________|______________________________________________________________________________|
|Actions → Play Minesweeper           |Play a game of Minesweeper, as described in the section called “Playing     |
|                                       |Minesweeper”.                                                               |
|_______________________________________|______________________________________________________________________________|
|Actions → Become root                |Continue working as the root user; see the section called “Becoming root”.|
|_______________________________________|______________________________________________________________________________|
|Actions → Quit (Q)                   |Quit aptitude, saving any changes to package states.                          |
|_______________________________________|______________________________________________________________________________|
|[a] Or any other apt utility.                                                                                         |
|______________________________________________________________________________________________________________________|




The Undo menu

Figure 2.2. Commands available in the Undo menu

 ______________________________________________________________________________
|Command                  |Description                                         |
|_________________________|____________________________________________________|
|                         |Cancel the effect of the last change to a package's |
|Undo → Undo (Control+u)|state, up to the last time aptitude was started, the|
|                         |package list was updated, or an install run was     |
|                         |performed.                                          |
|_________________________|____________________________________________________|




The Package menu

Figure 2.3. Commands available in the Package menu

 __________________________________________________________________________________________________________________
|Command                          |Description                                                                     |
|_________________________________|________________________________________________________________________________|
|Package → Install (+)          |Flag the currently selected package for installation.                           |
|_________________________________|________________________________________________________________________________|
|Package → Reinstall (L)        |Flag the currently selected package for reinstallation.                         |
|_________________________________|________________________________________________________________________________|
|Package → Remove (-)           |Flag the currently selected package for removal.                                |
|_________________________________|________________________________________________________________________________|
|Package → Purge (_)            |Flag the currently selected package to be purged.                               |
|_________________________________|________________________________________________________________________________|
|Package → Keep (:)             |Cancel any pending installation, upgrade, or removal of the currently selected  |
|                                 |package, and remove any hold that was set on the package.                       |
|_________________________________|________________________________________________________________________________|
|Package → Hold (=)             |Hold the currently selected package back.                                       |
|_________________________________|________________________________________________________________________________|
|                                 |Mark the currently selected package as an “automatically installed” package.|For
|Package → Mark Auto (M)        |more information on manually and automatically installed packages, see the      |
|                                 |section called “Managing automatically installed packages”.                 |
|_________________________________|________________________________________________________________________________|
|                                 |Mark the currently selected package as a “manually installed” package. For m|re
|Package → Mark Manual (m)      |information on manually and automatically installed packages, see the section   |
|                                 |called “Managing automatically installed packages”.                         |
|_________________________________|________________________________________________________________________________|
|                                 |If a package that can be upgraded is selected, forbid it from being upgraded to |
|Package → Forbid Version (F)   |the currently available version. If a version of a package is selected, forbid  |
|                                 |the package from being upgraded to that version.                                |
|_________________________________|________________________________________________________________________________|
|                                 |Display a screen containing information about the currently selected package,   |
|Package → Information (enter)  |such as the packages it depends upon, the packages which depend upon it, and its|
|                                 |available versions.                                                             |
|_________________________________|________________________________________________________________________________|
|                                 |When browsing the package list, cycles through the information that can be      |
|                                 |displayed in the information area (the lower half of the display). The          |
|Package → Cycle Information (i)|information area can display the long description of the selected package (its  |
|                                 |default behavior), a summary of the dependencies related to the package, or an  |
|                                 |analysis of which other packages require or suggest the selected package.       |
|_________________________________|________________________________________________________________________________|
|package → Changelog (C)        |Display the currently selected package's Debian changelog. To see the changelog |
|                                 |of a particular version, select that version and execute this command.          |
|_________________________________|________________________________________________________________________________|




The Resolver menu

Figure 2.4. Commands available in the Resolver menu

 ______________________________________________________________________________________________________________
|Command                           |Description                                                                |
|__________________________________|___________________________________________________________________________|
|Resolver → Examine Solution (e) |Display a detailed description of the problem resolver's current suggestion|
|                                  |(see the section called “Resolving Dependencies Interactively”).       |
|__________________________________|___________________________________________________________________________|
|Resolver → Apply Solution (!)   |Carry out the actions that the problem resolver is currently suggesting.   |
|__________________________________|___________________________________________________________________________|
|Resolver → Next Solution (.)    |Select the problem resolver's next suggestion.                             |
|__________________________________|___________________________________________________________________________|
|Resolver → Previous Solution (,)|Select the problem resolver's previous suggestion.                         |
|__________________________________|___________________________________________________________________________|
|Resolver → First Solution (<)   |Select the problem resolver's first suggestion.                            |
|__________________________________|___________________________________________________________________________|
|Resolver → Last Solution (>)    |Select the problem resolver's most recently generated solution (see the    |
|                                  |section called “Resolving Dependencies Interactively”).                |
|__________________________________|___________________________________________________________________________|
|                                  |When examining a solution, toggle whether the currently selected action is |
|Resolver → Toggle Rejected (r)  |rejected and move to the next action (see the section called “Resolving  |
|                                  |Dependencies Interactively”). If the action is currently approved, its   |
|                                  |approval will be cancelled.                                                |
|__________________________________|___________________________________________________________________________|
|                                  |When examining a solution, toggle whether the currently selected action is |
|Resolver → Toggle Approved (a)  |approved and move to the next action (see the section called “Resolving  |
|                                  |Dependencies Interactively”). If the action is currently rejected, its   |
|                                  |rejection will be cancelled.                                               |
|__________________________________|___________________________________________________________________________|
|                                  |When examining a solution, view detailed information about the package     |
|Resolver → View Target (Enter)  |which is affected by the currently selected action (see the section called |
|                                  |“Resolving Dependencies Interactively”).                               |
|__________________________________|___________________________________________________________________________|
|                                  |Reject (as if with Resolver → Toggle Rejected (r)) all actions that would|
|                                  |break a hold on a package or install a forbidden version. These actions are|
|Resolver → Reject Breaking Holds|rejected by default unless Aptitude::ProblemResolver::Allow-Break-Holds is |
|                                  |set to true, but this menu item allows you to reject them manually at any  |
|                                  |time.                                                                      |
|__________________________________|___________________________________________________________________________|




The Search menu

Figure 2.5. Commands available in the Search menu

 __________________________________________________________________________________________________________
|Command                            |Description                                                           |
|___________________________________|______________________________________________________________________|
|Search → Find (/)                |Find the next package in the package list that matches a search       |
|                                   |pattern (see the section called “Search patterns”).               |
|___________________________________|______________________________________________________________________|
|Search → Find Backwards (\)      |Find the previous package in the package list that matches a search   |
|                                   |pattern (see the section called “Search patterns”).               |
|___________________________________|______________________________________________________________________|
|Search → Find Again (n)          |Repeat the last Find command.                                         |
|___________________________________|______________________________________________________________________|
|                                   |Repeat the last Find command, but in the opposite direction. If the   |
|Search → Find Again Backwards (N)|last Find command was Find Backwards, this will perform a forwards    |
|                                   |search, and vice versa.                                               |
|___________________________________|______________________________________________________________________|
|Search → Limit Display (l)       |Filter the current package list by removing any packages which do not |
|                                   |match a search pattern (see the section called “Search patterns”).|
|___________________________________|______________________________________________________________________|
|Search → Un-Limit Display        |Un-filter the current package list (all packages will be shown).      |
|___________________________________|______________________________________________________________________|
|Search → Find Broken (b)         |Find the next broken package. This is equivalent to searching for     |
|                                   |?broken.                                                              |
|___________________________________|______________________________________________________________________|




The Options menu

Figure 2.6. Commands available in the Options menu

 ______________________________________________________________________________
|Command                   |Description                                        |
|__________________________|___________________________________________________|
|                          |Open a new top-level view in which you can modify  |
|                          |aptitude's settings. Configuration options are     |
|                          |displayed in a tree similar to the tree of         |
|Options → Preferences   |packages; to enable or disable an option, select it|
|                          |and press Space or Enter. Configuration options are|
|                          |saved to ~/.aptitude/config immediately upon being |
|                          |selected.                                          |
|__________________________|___________________________________________________|
|Options → Revert options|Reset all options to their default values.         |
|__________________________|___________________________________________________|




The Views menu


IMG.alt.suffix Note
  = \[Note]]
               For an overview of how views work, see the section called “Working with
               multiple views”.


Figure 2.7. Commands available in the Views menu

 ______________________________________________________________________________
|Command                        |Description                                   |
|_______________________________|______________________________________________|
|Views → Next (F6)            |Change to the next active view.               |
|_______________________________|______________________________________________|
|Views → Prev (F7)            |Change to the previous active view.           |
|_______________________________|______________________________________________|
|Views → Close (q)            |Close the current view.                       |
|_______________________________|______________________________________________|
|Views → New Package View     |Create a new view of the package list.        |
|_______________________________|______________________________________________|
|                               |Create a view that displays packages which are|
|Views → Audit Recommendations|not installed, and which a package installed  |
|                               |on your system Recommends.                    |
|_______________________________|______________________________________________|
|Views → New Flat Package List|Create a new view of the package list in which|
|                               |packages are not categorized.                 |
|_______________________________|______________________________________________|
|                               |Create a new view of the package list in which|
|Views → New Debtags Browser  |packages are categorized according to their   |
|                               |debtags entries.                              |
|_______________________________|______________________________________________|
|                               |A number of additional menu items appear;     |
|Additional items               |these correspond to the currently active      |
|                               |views. To switch directly to a view, select it|
|                               |from the menu.                                |
|_______________________________|______________________________________________|




The Help menu

Figure 2.8. Commands available in the Help menu

 ______________________________________________________________________________
|Command               |Description                                            |
|______________________|_______________________________________________________|
|Help → About        |Display some copyright information.                    |
|______________________|_______________________________________________________|
|Help → Help (?)     |Display the on-line help page.                         |
|______________________|_______________________________________________________|
|Help → User's Manual|Display the User's Manual (this document).             |
|______________________|_______________________________________________________|
|Help → FAQ          |Display the aptitude FAQ.                              |
|______________________|_______________________________________________________|
|Help → ChangeLog    |Display a history of the major changes made to         |
|                      |aptitude.                                              |
|______________________|_______________________________________________________|
|Help → License      |Display the terms under which you may copy, modify, and|
|                      |distribute aptitude.                                   |
|______________________|_______________________________________________________|




Working with multiple views

aptitude allows you to work with several “views” at once. A “view” (sometimes
called a “screen”) is simply something that can appear in the area of the screen
below the menu bar. The most common view is the package list, but download views
are also common.

When several views are open at once, a bar listing all the active views will
appear at the top of the screen. For instance, if I examine apt by pressing
Enter, then examine libc6, the screen will look something like this:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
         Packages                  apt info                  libc6 info
aptitude 0.3.1
i A  --\ libc6                                             2.3.2.ds1- 2.3.2.ds1-
  Description: GNU C Library: Shared libraries and Timezone data
    Contains the standard libraries that are used by nearly all programs on the
    system. This package includes shared versions of the standard C library and
    the standard math library, as well as many others. Timezone data is also
    included.
  Priority: required
  Section: base
  Maintainer: GNU Libc Maintainers <debian-glibc@lists.debian.org>
  Compressed size: 4901k
  Uncompressed size: 15.9M
  Source Package: glibc
  --\ Depends
    --- libdb1-compat
  --\ Suggests
    --- locales
    --- glibc-doc
  --\ Conflicts
GNU C Library: Shared libraries and Timezone data

You can close the current view using Views → Close (q). To switch to the next or
previous view, use Views → Next (F6) and Views → Prev (F7), or click on the
view's name at the top of the screen; you can also find a list of all active
views in the Views menu.

As shown above, some commands (for instance, viewing information about a
package) will create new views automatically; you can also explicitly create a
new view using Views → New Package View.


Becoming root

Some actions, such as updating the package lists, can only be performed as root.
If you are not root and you try to update the package lists, aptitude will ask
if you want to become root:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
--- Installed Packages
--- Not Installed Packages
--- Obsolete and Locally Created Packages
--- Virtual Packages
--- Tasks

  +-------------------------------------------------------------------------+
  |Updating the package lists requires administrative privileges, which     |
  |you currently do not have.  Would you like to change to the root account?|
  |                                                                         |
  |         [ Become root ]                  [ Don't become root ]          |
Th+-------------------------------------------------------------------------+








If you select “Become root”, aptitude will prompt you for root's password; when
you have correctly entered it, aptitude will perform the action that required
root privileges. You will still be root after the action completes.

You can switch to the root account at any time using the command Actions →
Become root. Any changes you have made to package states will be preserved (but
will not be saved until you quit aptitude).

By default, aptitude will use the command su to gain root privileges. If you
would like it to use some other command (such as sudo), set the configuration
option Aptitude::Get-Root-Command.


Managing packages

This section describes how to manipulate the list of packages, how to install
new packages on your system, and how to remove old packages.


Managing the package list

To keep the list of packages up-to-date, it is recommended that you periodically
update it. You can do this using the Actions → Update package list (u) command.


Accessing package information

Information about packages is presented in several locations in aptitude: the
package list gives a quick overview of the state of each package, and additional
views providing detailed information about a package are also available.


The package list

The package list displays an “at-a-glance” synopsis of a package's state. For
instance, the package webmin might have the following synopsis:

piAU  webmin                                        +5837kB <none>     1.160-2

The four characters on the left-hand side of the synopsis show that the package
is not installed (“p”), that it is going to be installed (“i”), that it was
automatically chosen to be installed (“A”), and that it is untrusted (“U”). On
the right-hand side of the synopsis, the current version and the most recent
available version are displayed, along with an indication of how much space will
be used by the upgrade.


IMG.alt.suffix Tip
  = \[Tip]]
               You can customize how package synopses are displayed; see the section
               called “Customizing how packages are displayed” for details.


The four status flags on the left-hand side of the screen give the basic
information about a package's state. The first character is the package's
current state. The second character is the action which will be taken on the
package. The third character indicates whether the package was automatically
installed (see the section called “Managing automatically installed packages”),
and the fourth character indicates whether the package is trusted (see the
section called “Understanding and managing package trust”).

The possible values of the “current state” flag are given in Figure 2.9, “Values
of the “current state” flag” and the possible values of the “action” flag are
given in Figure 2.10, “Values of the “action” flag”.

Figure 2.9. Values of the “current state” flag


i - the package is installed and all its dependencies are satisfied.

c - the package was removed, but its configuration files are still present.

p - the package and all its configuration files were removed, or the package was
    never installed.

v - the package is virtual.

B - the package has broken dependencies.

u - the package has been unpacked but not configured.

C - half-configured: the package's configuration was interrupted.

H - half-installed: the package's installation was interrupted.

W - triggers-awaited: the package awaits trigger processing by another package.

T - triggers-pending: The package has had an update triggered due to changes in
    another package.




Figure 2.10. Values of the “action” flag


i - the package will be installed.

u - the package will be upgraded.

w - the package will be downgraded.

d - the package will be deleted: it will be removed, but its configuration files
    will remain on the system.

p - the package will be purged: it and its configuration files will be removed.

h - the package will be held back: it will be kept at its current version, even
    if a newer version becomes available, until the hold is cancelled.

F - An upgrade of the package has been forbidden.

r - the package will be reinstalled.

    the package is “broken”: some of its dependencies will not be satisfied.
B - aptitude will not allow you to install, remove, or upgrade anything while
    you have broken packages.




In addition, aptitude will use colors to indicate package state if your terminal
supports it. State distinctions are mainly displayed using the background color:



  Black
      The package cannot be upgraded (or is not going to be installed), and it
      has no dependency problems. If the package is installed, its name will be
      highlighted.


  Green
      The package is going to be installed.


  Blue
      The package is currently installed, and it will be upgraded.


  Brown
      The package is currently installed, and it will be downgraded.


  Magenta
      The package is currently installed, but it will be removed.


  White
      The package is currently installed, and it is “held” at its current
      version: automatic upgrades will ignore it.


  Red
      This package is broken: some of its dependencies will not be satisfied.


Finally, the lower half of the screen displays the long description. aptitude
will attempt to detect whether the package is involved in a dependency problem;
if so, information regarding the dependency problem will be displayed here. To
cycle between dependency information and the package description, press i.


Detailed package information

Pressing Enter while a package is highlighted will display the package
information screen:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.2.14.1
i A --\ apt                                                0.5.25     0.5.25
  Description: Advanced front-end for dpkg
    This is Debian's next generation front-end for the dpkg package manager. It
    provides the apt-get utility and APT dselect method that provides a simpler,
    safer way to install and upgrade packages.

    APT features complete installation ordering, multiple source capability and
    several other unique features, see the Users Guide in apt-doc.
  Essential: yes
  Priority: important
  Section: base
  Maintainer: APT Development Team <deity@lists.debian.org>
  Compressed size: 970k
  Uncompressed size: 2961k
  Source Package: apt
  --\ Depends
    --- libc6 (>= 2.3.2.ds1-4)
    --- libgcc1 (>= 1:3.3.3-1)
    --- libstdc++5 (>= 1:3.3.3-1)
  --\ Suggests
    --- aptitude | synaptic | gnome-apt | wajig
    --- dpkg-dev
    --\ apt-doc (UNSATISFIED)
p     0.6.25
p     0.5.25
  --\ Replaces
    --- libapt-pkg-doc (< 0.3.7)
    --- libapt-pkg-dev (< 0.3.7)
  --- Package names provided by apt
  --- Packages which depend on apt
  --\ Versions
p A 0.6.25
i A 0.5.25

This display can be navigated in a manner similar to the package list: for
instance, in the screenshot above, I expanded the dependency on apt-doc,
revealing the available versions of apt-doc which will fulfill the dependency.
These versions can be manipulated in the same way that packages can: for
instance, to install version 0.5.25 of apt-doc, you would highlight it and press
+.


IMG.alt.suffix = \[Tip]] Tip

                         To quickly satisfy a dependency, select the dependency
                         and press +; aptitude will attempt to automatically
                         satisfy it.


In addition to the dependencies of a package, you can view the package names
that it Provides, the packages which depend upon it, and the available versions
of the package (including any other packages that Provide it).

As usual, you can dismiss this screen and return to the main view by pressing q.
For convenience, a few other information screens (which only display some
commonly-used information, hiding the rest) are available: press v to view the
versions of a package, d to view the dependencies of a package, and r to view
the “reverse dependencies” of a package (packages which depend upon it).


Modifying package states

The following commands are available to modify the states of packages. Commands
take effect the next time you perform an install run; until you do, all of these
commands can be reversed using Undo  Undo (Control+u).

To apply a command to a package, simply select the package in a package list and
issue the command. These commands can also be applied to groups of packages by
selecting the group header (for instance, “Upgradable Packages”) and issuing the
command.

 _____________________________________________________________________________________________________________________________________
|Command                                               |Description                                                                   |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Flag the current package for installation.                                    |
|                                                      |                                                                              |
|Install: Package  Install (+)                      |If the package is not installed, it will be installed. If it is already       |
|                                                      |installed, it will be upgraded if possible and any sticky upgrade prevention  |
|                                                      |that is in effect (eg, Hold) will be cancelled.                               |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Flag the currently selected package for removal.                              |
|Remove: Package  Remove (-)                        |                                                                              |
|                                                      |If the package is installed, it will be removed.                              |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Flag the current package to be purged.                                        |
|                                                      |                                                                              |
|Purge: Package  Purge (_)                          |If the package is installed, it will be removed. Furthermore, even if it is   |
|                                                      |removed, any remaining files (such as configuration files) related to the     |
|                                                      |package will be removed from the system.                                      |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Flag the current package to be kept at its current version.                   |
|                                                      |                                                                              |
|Keep: Package  Keep (:)                            |Any action that was to be performed on the package -- installation, removal,  |
|                                                      |or upgrade -- is cancelled, and any persistent hold that was set on the       |
|                                                      |package is removed.                                                           |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Set a persistent hold on the package.                                         |
|                                                      |                                                                              |
|Hold: Package  Hold (=)                            |As with Keep, any action that was to be performed on the package is cancelled.|
|                                                      |In addition, the package will not be automatically upgraded [a] until the hold|
|                                                      |is removed. You may cancel a hold by issuing the Install command.             |
|______________________________________________________|______________________________________________________________________________|
|                                                      |The package will not be automatically upgraded[a] to the version it would     |
|                                                      |currently be upgraded to. If it was going to be upgraded, the upgrade will be |
|                                                      |cancelled.                                                                    |
|                                                      |                                                                              |
|Package  Forbid Version (F)                        |If you issue this command on a particular version of a package, the package   |
|                                                      |will not be upgraded to the selected version. Note that only one version can  |
|                                                      |be forbidden at once.                                                         |
|                                                      |                                                                              |
|                                                      |This functionality is largely provided as a convenience for users of the      |
|                                                      |“unstable” distribution, so they can avoid known-bad versions of packages.|
|______________________________________________________|______________________________________________________________________________|
|                                                      |Flag the current package for reinstallation.                                  |
|                                                      |                                                                              |
|Reinstall: Package  Reinstall (L)                  |Note that the reinstallation will not be saved when you quit aptitude or      |
|                                                      |perform an install run, for technical reasons (essentially, the underlying    |
|                                                      |software layers (dpkg and apt) do not provide any way to find out whether a   |
|                                                      |reinstallation was successful or not).                                        |
|______________________________________________________|______________________________________________________________________________|
|                                                      |Sets whether the package is treated as having been automatically installed;   |
|Package  Mark Auto (M), Package  Mark Manual (m)|automatically installed packages will be removed when no other package        |
|                                                      |requires them. For more information, see the section called “Managing       |
|                                                      |automatically installed packages”.                                          |
|______________________________________________________|______________________________________________________________________________|
|[a] That is, it will be unaffected by Actions  Mark Upgradable (U) or the full-upgrade or safe-upgrade command-line actions.      |
|_____________________________________________________________________________________________________________________________________|

In addition to these commands that affect the selected package, there are two
commands that affect large numbers of packages at once regardless of what is
selected. Actions  Forget new packages (f) clears the “new” status of all
packages in the package list, and Actions  Mark Upgradable (U) flags every
package which can be upgraded for upgrade, except for packages that are held
back or would be upgraded to a forbidden version.


IMG.alt.suffix = \[Note]] Note

                          All changes to package states are saved when you quit
                          aptitude, update the package list, or perform an
                          install run. If you do not wish to save your changes,
                          you can always abort aptitude by pressing Ctrl-C.



Downloading, installing, and removing packages

Changing package states as described in the previous section does not actually
affect what is installed on your system. Thus, you can adjust the state of
packages without affecting your system until you are happy with what you see;
once you are, you can “commit” the changes by actually installing and removing
packages.[8]

To commit your changes, use the Actions  Install/remove packages (g) command.
Selecting this command will display a preview screen describing the changes that
will be performed. This screen is just a package list, and you can manipulate
the packages (for instance, cancelling unwanted removals) in the same way that
you could in the main list.

When you are done, use Views  Close (q) to cancel the installation, or use
Actions  Install/remove packages (g) to proceed. aptitude will download any
files that need to be downloaded, then prompt you to continue with the
installation. When you select “Continue”, the installations and removals will
commence.

Packages that are downloaded by aptitude are placed in a cache directory
(typically /var/cache/apt/archives). Normally, they are just left in this
directory ad infinitum. To delete all the files in this directory, use Actions 
Clean package cache; to delete only files which cannot be downloaded again (ie,
obsolete packages), use Actions  Clean obsolete files.


Understanding and managing package trust

apt's ability to access multiple package sources leads to a potential security
vulnerability. Suppose you add an archive of packages published by Joe Random
Hacker to your sources.list file in order to install Joe's gargleblast package.
It is possible, however, that -- unbeknownst to you -- Joe's archive also
contains his own “customized” versions of packages such as libc6 and
ssh...versions that steal your private information or open backdoors on your
system! If these packages have higher version numbers than the legitimate Debian
packages, apt will blithely install them on your system during your next
upgrade, allowing Joe to do his dirty work undetected. Joe could also break into
your mirror of the Debian archives and replace the legitimate software with his
doctored version.

Luckily, newer versions of apt and aptitude, such as the version documented in
this manual, have built-in safeguards to help defeat this type of attack. apt
uses strong security mechanisms based on the popular GPG encryption software to
verify that the packages being distributed from the official Debian mirrors are
the same packages that were uploaded by the Debian developers. aptitude will
then warn you if you attempt to install a package from a non-Debian source, or
if you attempt to upgrade a package that was installed from a Debian source to a
version that came from a non-Debian source.


IMG.alt.suffix = \[Warning]] Warning

                             The security mechanisms in apt provide a near-
                             perfect guarantee that the contents of your archive
                             mirror are identical to the contents of the master
                             Debian archive. However, they are not a panacea:
                             for instance, there are many ways that a tampered
                             package could theoretically find its way into the
                             master Debian archive.

                             Ensuring that you only install software from a
                             trusted source will give you an important degree of
                             protection against malicious packages, but it
                             cannot eliminate all the risks inherent in
                             installing software.



Understanding trust

apt allows the administrator of an archive to provide a signature of the
archive's index. This signature, which (for all practical purposes) cannot be
forged, indicates that the package files listed in the index are the same files
that the administrator intended to place in the archive: ie, that the contents
of the archive have not been tampered with since it was created.[9] The
signature can be validated by checking that it corresponds to the
administrator's public key. The public key of the Debian archive is distributed
with apt, typically on your Debian CD.

When aptitude downloads an archive index, it will check whether the index is
properly signed. If it is unsigned, aptitude will not trust package files from
that archive. (see below for information on what this means) If it has a
signature but the signature is incorrect or cannot be verified, a warning will
be printed and aptitude will refuse to trust packages from that archive.

Later, when you perform an install run, aptitude will check whether the packages
are from trusted sources. If an untrusted package is being installed, or a
package is being upgraded from a trusted to an untrusted version, a warning will
be displayed and you will have the opportunity to abort the download:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.3.0                    Will use 831kB of disk space   DL Size: 30.4MB
--\ Packages to be upgraded
iu U wesnoth                                       -98.3kB 0.8.7-1    0.8.8-1.0w
iuAU wesnoth-data                                  +930kB  0.8.7-1    0.8.8-1.0w
+------------------------------------------------------------------------------+
|WARNING: untrusted versions of the following packages will be installed!     #|
|                                                                             #|
|Untrusted packages could compromise your system's security.  You should only #|
|proceed with the installation if you are certain that this is what you want  #|
|to do.                                                                       #|
|                                                                             #|
|  * wesnoth [version 0.8.8-1.0wesnoth.org]                                   #|
|  * wesnoth-data [version 0.8.8-1.0wesnoth.org]                              #|
|  * wesnoth-music [version 0.8.8-1.0wesnoth.org]                             #|
|         [ Really Continue ]                  [ Abort Installation ]          |
+------------------------------------------------------------------------------+
                                                                               #
                                                                               #
                                                                               #
                                                                               #
                                                                               #
                                                                               #


Trusting additional keys

You might find it useful to allow apt to trust additional archives, besides the
main Debian archive. For each archive that you want to trust, you will have to
acquire the public key that is used to sign the archive's package index. This is
typically a text file whose name ends in .asc; it might be provided by the site
administrator or downloadable from a public keyserver. For more information on
what public keys are and how to get them, see the GPG web page.

The list of keys that apt will trust is stored in the keyring file /etc/apt/
trusted.gpg. Once you have the GPG key, you can add it to this file by executing
the command gpg --no-default-keyring --keyring /etc/apt/trusted.gpg --import
newkey.asc. aptitude will then trust any archive that is signed with the key
contained in newkey.asc.


IMG.alt.suffix = \[Warning]] Warning

                             Once an archive's key has been added to the APT
                             keyring, it will be trusted just as much as the
                             main Debian mirrors themselves! You should only do
                             this if you are very confident that the key you are
                             adding is correct and that the person who holds the
                             key is trustworthy and competent.



Managing automatically installed packages

To install one package, it is often necessary to install several others (to
fulfill its dependencies). For instance, if you wish to install the clanbomber
package, you must also install the package libclanlib2. If you remove clanbomber
again, you probably no longer need the libclanlib2 package; aptitude will
attempt to detect this and automatically remove the libclanlib2 package.

It works like this: when you install a package, aptitude will automatically
install any other packages on which it depends. These packages are marked as
having been “automatically installed”; aptitude will monitor them and remove
them when they are no longer depended upon by any manually installed package
[10] . They will appear in the preview as “packages being removed because they
are no longer used.”

As with any automatic process, there is a potential for things to go haywire.
For instance, even if a package was automatically installed to start with, it
might turn out to be useful in its own right. You can cancel the “automatic”
flag at any time by pressing m; if the package is already being removed, you can
use Package  Install (+) to cancel the removal and clear the “automatic” flag.


Resolving package dependencies


Dependency resolution in aptitude

There are two main dependency resolution algorithms in aptitude.

The first is an algorithm that is also used by programs such as apt-get and
synaptic; I will call it “immediate resolution”. It is invoked whenever you
select a package for installation interactively, and immediately after one or
more packages are marked for installation at the command-line. Immediate
resolution is fast and will solve most dependency problems, but it is sometimes
unable to find any solution.

The second algorithm, which I will call “interactive resolution”, is invoked
when packages have broken dependencies even after immediate resolution[11]. It
can resolve more dependencies, it allows you to review a solution before
applying it, and it allows you to provide feedback to the resolver, guiding it
towards a better solution.


Immediate dependency resolution

Whenever you choose to install or upgrade a package in aptitude, aptitude makes
an immediate attempt to resolve any of its dependencies that are not fulfilled.
For each unsatisfied dependency (either a “Depends”, a “Recommends”, or a
“Conflicts”), it performs the following steps:


  1. If the dependency is a recommendation, aptitude tries to guess whether it
     is a “new” recommendation or a “previously satisfied” recommendation.
     aptitude considers a recommendation to be “new” if the package declaring
     the recommendation is not currently installed, or if its installed version
     does not recommend a package of the same name. On the other hand, a
     recommendation is “previously satisfied” if the package declaring the
     recommendation is installed, the currently installed version recommends a
     package of the same name, and that recommendation is currently fulfilled.

     For example: suppose that version 1.0 of prog recommends version 4.0 of
     libcool1, but version 2.0 of prog recommends version 5.0 of libcool1, and
     also recommends apache. If you choose to upgrade prog from version 1.0 to
     version 2.0, the recommendation of apache will be considered to be “new”
     because version 1.0 of prog did not recommend apache. On the other hand,
     the recommendation of libcool1 is not “new”, because version 1.0 of prog
     recommended libcool1, even though it recommended a different version.
     However, if libcool1 is installed, then that recommendation will be
     considered to be “previously satisfied”.

     If the configuration option APT::Install-Recommends is true, aptitude will
     always attempt to fulfill “new” and “previously satisfied” recommendations;
     all others will be ignored by immediate resolution. If that option is
     false, immediate dependency resolution will ignore all recommendations.

  2. If the dependency is on several packages combined with OR, examine each of
     the alternatives in the order that they are given. For instance, if a
     package depends on “exim | mail-transport-agent”, aptitude will first
     process exim, then mail-transport-agent.

  3. For each alternative, attempt to resolve it. If the dependency is a
     conflict, remove the current alternative if it is installed (and for an
     unversioned conflict, also remove any package providing the target of the
     conflict). Otherwise, install the candidate version of the current
     alternative if it satisfies the dependency. If not, or if there is no
     candidate version (for instance, because the current alternative is a
     virtual package), and if the dependency is unversioned, attempt to install
     the highest-priority package[12] whose candidate version provides the
     target of the current alternative.

     For instance, say we are attempting to resolve “Depends: exim | mail-
     transport-agent”. aptitude will first attempt to install the package exim.
     If exim is not available, aptitude will then attempt to install the
     highest-priority package whose candidate version provides exim. If there is
     no such package, aptitude will install the highest-priority package whose
     candidate version provides the virtual package mail-transport-agent. On the
     other hand, suppose that the dependency is “Depends: exim (>= 2.0.0) |
     mail-transport-agent”, but only version 1.0 of exim is available. In this
     case, aptitude will not install exim (because the version does not match),
     nor will it attempt to install packages providing exim (because virtual
     packages cannot match a dependency with a version restriction). Thus,
     aptitude will fall back to installing the highest-priority package whose
     candidate version provides mail-transport-agent.

  4. If a package was installed by the previous step, resolve its dependencies
     using this algorithm, then stop.


While this technique very often solves all the outstanding package dependencies,
it can fail in a number of common circumstances.


* Conflicts are resolved by removing the package that is the target of the
  conflict. But now other packages that depend on this package have unresolved
  dependencies; the immediate resolver makes no attempt to fix them.

* A dependency might not be satisfiable due to version restrictions and due to
  the limitation that only candidate versions are considered. For instance, say
  that versions 1.0 and 2.0 of fileutils are available, that the candidate
  version is 1.0, and that the package octopus declares a dependency “Depends:
  fileutils (>= 2.0)”. Immediate resolution is unable to resolve this
  dependency: it will never consider version 2.0 of the package, since that is
  not the candidate version.


The interactive dependency resolver can solve these situations and more. When
there are broken dependencies left over, or when immediate dependency resolution
is disabled, the interactive resolver will automatically start searching for a
solution. The next section describes how to use the interactive dependency
resolver.


Resolving Dependencies Interactively

If a dependency problem arises that cannot be handled using the immediate
dependency resolver, aptitude can assist you in resolving it. As soon as a
problem occurs, a red bar will appear at the bottom of the screen with a summary
of aptitude's suggestion about how to fix it. For instance, in the following
screenshot, aptitude is indicating that it can resolve the situation by keeping
two packages at their current versions.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
aptitude 0.3.3       #Broken: 1   Will free 48.6MB of disk space
i A   nautilus                                             2.10.1-4   2.10.1-4
i     nautilus-cd-burner                                   2.10.2-1.1 2.10.2-1.1
i A   nautilus-data                                        2.10.1-4   2.10.1-4
i     netspeed                                             0.12.1-1   0.12.1-1
i A   oaf                                                  0.6.10-3   0.6.10-3
i     pybliographer                                        1.2.6.2-1  1.2.6.2-1
i     rhythmbox                                            0.8.8-13   0.8.8-13
i     shermans-aquarium                                    3.0.1-1    3.0.1-1
idA   sound-juicer                                 -1733kB 2.10.1-3   2.10.1-3
GNOME 2 CD Ripper
sound-juicer will be removed.


The following packages depend on sound-juicer and will be broken by its
removal:


  * gnome-desktop-environment depends on sound-juicer

[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

As indicated at the bottom of the screen, you can view additional solutions by
pressing . and ,, apply the current solution by pressing !, and examine the
solution in more detail by pressing e. When you examine the current solution, a
screen similar to the following will appear:

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
    gstreamer0.8-cdparanoia                           [0.8.10-1 (unstable, now)]
    sound-juicer                                                [2.10.1-2 (now)]
















[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

You can access information about the package affected by an action by simply
pressing Enter while the package is highlighted. For a more detailed explanation
of why aptitude made a particular decision, you can highlight the element in the
list. When you do so, the lower half of the screen will display the dependency
which was resolved by aptitude's choice, along with every way in which this
dependency could have been resolved.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
    gstreamer0.8-cdparanoia                           [0.8.11-1 (unstable, now)]
    sound-juicer                                      [2.10.1-3 (unstable, now)]






cdparanoia plugin for GStreamer
sound-juicer depends upon gstreamer0.8-cdparanoia
--\ The following actions will resolve this dependency:
  -> Downgrade sound-juicer [2.10.1-3 (unstable, now) -> 0.6.1-2 (testing)]
  -> Remove sound-juicer [2.10.1-3 (unstable, now)]
  -> Cancel the removal of gstreamer0.8-cdparanoia
  -> Downgrade gstreamer0.8-cdparanoia [0.8.11-1 (unstable, now) -> 0.8.8-3 (tes



[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

You can guide the dependency resolver to a solution of which you approve by
approving or rejecting the individual actions of a solution. If you approve an
action, the resolver will choose it whenever possible, ignoring alternatives
(when there are several approved alternatives, any one of them could be chosen).
On the other hand, if you reject an action, the resolver will never choose that
action.

To reject an action, highlight it and press r; the rejection can be cancelled by
pressing r again. Similarly, select an action and press a to approve it; press a
again to restore its original state. You can undo either action by using Undo →
Undo (Control+u) while the resolver screen is active. If you cancel a rejection
or an approval, any solutions that were ignored will be available the next time
that you generate a new solution.


IMG.alt.suffix = \[Note]] Note

                          By default, the resolver rejects actions that change
                          the state of held packages, or that install forbidden
                          versions of packages. You can override these
                          rejections, thus allowing the hold or forbidding to be
                          automatically overridden, in the same way that you
                          would override any other rejection. Setting the
                          configuration option Aptitude::ProblemResolver::Allow-
                          Break-Holds to true will disable this behavior,
                          meaning that the resolver will always break holds
                          (albeit at a penalty, see Aptitude::ProblemResolver::
                          BreakHoldScore).


Rejected actions are colored red and marked with an “R”, while approved actions
are colored green and marked with an “A”. You can see this in the following
screenshot, where the action “keep gstreamer0.8-cdparanoia at its current
version” has been rejected, and the action “keep sound-juicer at its current
version” has been approved.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ Keep the following packages at their current version:
R   gstreamer0.8-cdparanoia                           [0.8.11-1 (unstable, now)]
A   sound-juicer                                      [2.10.1-3 (unstable, now)]
















[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

Rejections and approvals only affect newly generated solutions. You can tell
when a new solution will be generated by examining the indicator in the lower
left hand corner of the screen: if there is a number in parentheses, it is the
number of solutions that have been generated. Thus, when the number outside the
parentheses and the number inside are identical (as above), pressing . will
generate a new solution. If there is no number in parentheses (for instance, the
indicator reads [1/5]), then there are no more solutions to generate. At any
time, you can select the last generated solution by pressing >, and the first
generated solution by pressing <.


IMG.alt.suffix = \[Important]] Important

                               The state of the problem resolver is discarded
                               when you modify the state of any package. If you
                               mark a package for installation, for upgrade, for
                               removal, etc, the resolver will forget all of
                               your rejections and approvals, as well as all the
                               solutions that have been generated so far.


In addition to selecting actions in the list at the top of the screen, you can
also select them using the list in the bottom half. To access this list, either
click in it using the mouse or press Tab. Finally, to see the decisions that the
problem resolver took arranged in order, press o. This will give a list of the
dependencies that were resolved and the action taken to resolve them, as in the
following screenshot.

 Actions  Undo  Package  Resolver  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
                Packages                          Resolve Dependencies
  --\ gnome-desktop-environment depends upon sound-juicer
    -> Cancel the removal of sound-juicer
  --\ sound-juicer depends upon gstreamer0.8-cdparanoia
    -> Cancel the removal of gstreamer0.8-cdparanoia





GNOME 2 CD Ripper
gnome-desktop-environment depends upon sound-juicer
--\ The following actions will resolve this dependency:
  -> Remove gnome-desktop-environment [1:2.10.2.3 (unstable, testing, now)]
  -> Cancel the removal of sound-juicer
  -> Downgrade sound-juicer [2.10.1-3 (unstable, now) -> 0.6.1-2 (testing)]




[1(1)/...] Suggest 2 keeps
e: Examine  !: Apply  .: Next  ,: Previous

You can leave this display mode by pressing o again.


Costs in the interactive dependency resolver


Costs and cost components

The cost of a solution produced by the interactive dependency resolver is a
value that aptitude uses to determine how “bad” that solution is. Solutions that
are “better” are always displayed before solutions that are “worse”. The cost of
solutions is defined in the configuration option Aptitude::ProblemResolver::
SolutionCost.

Some typical costs are shown in Example 2.1, “Sample resolver costs”.

Example 2.1. Sample resolver costs

The default cost, sorting solutions by their safety cost, then by their apt pin
priority:

safety, priority

Remove as few packages as possible, then cancel as few actions as possible:

removals, canceled-actions

Sort solutions by the number of packages they remove plus twice the number of
actions they cancel.

removals + 2 * canceled-actions



As can be seen from the above examples, a cost is not necessarily a single
number. In fact, a cost consists of one or more cost components, each of which
is a number associated with the solution. When sorting solutions, the resolver
examines cost components in order, proceeding to later components only if the
earlier ones are equal. For instance, in the cost “removals, canceled-actions”,
solutions with fewer removals always appear before solutions with more removals,
regardless of how many canceled actions they have. However, solutions with the
same number of removals are sorted so that solutions with fewer canceled actions
appear first.

Cost components come in two flavors: basic cost components and compound cost
components.

Basic components simply name some property of the solution, such as “upgrades”
or “removals”. A list of built-in basic components provided by aptitude can be
found in Table 2.1, “Basic cost components”. You can also create your own cost
components using the add-to-cost-component and raise-cost-component hints; see
the section called “Configuring resolver hints” for details.

Each basic component is either a counter or a level. Counters count how many of
a solution's actions meet some condition (such as removing packages or
installing new packages), while levels associate a number with each action and
compute the highest number associated with any action in the solution.

Table 2.1. Basic cost components

 _____________________________________________________________________________________________
|Name     |Type   |Description                                                                |
|_________|_______|___________________________________________________________________________|
|broken-  |Counter|Counts the number of holds that the solution breaks, if the resolver is    |
|holds    |       |allowed to break holds (Aptitude::ProblemResolver::Allow-Break-Holds).     |
|_________|_______|___________________________________________________________________________|
|canceled-|Counter|Counts the number of pending actions that the solution cancels (keeping    |
|actions  |       |packages at their current version).                                        |
|_________|_______|___________________________________________________________________________|
|installs |Counter|Counts the number of packages that the solution installs.                  |
|_________|_______|___________________________________________________________________________|
|non-     |       |Counts the number of versions that the solution installs or upgrades from  |
|default- |Counter|non-default sources.                                                       |
|versions |       |                                                                           |
|_________|_______|___________________________________________________________________________|
|         |       |A value that increases as the apt pin priority of a version decreases.     |
|priority |Level  |Specifically, this is computed by negating the pin priority (so, e.g., if  |
|         |       |the pin priority is 500, this component will compute -500).                |
|_________|_______|___________________________________________________________________________|
|removals |Counter|Counts the number of packages that the solution removes.                   |
|_________|_______|___________________________________________________________________________|
|removals-|Counter|Counts the number of manually installed packages that the solution removes.|
|of-manual|       |                                                                           |
|_________|_______|___________________________________________________________________________|
|safety   |Level  |A broad heuristic that increases as actions become less “safe”; see the|
|         |       |section called “Safety costs” for details.                             |
|_________|_______|___________________________________________________________________________|
|upgrades |Counter|Counts the number of packages that the solution upgrades.                  |
|_________|_______|___________________________________________________________________________|



Compound components are built by combining the values of basic components. For
instance, removals + canceled-actions adds the components removal and canceled-
actions, resulting in a component that counts the number of removals and
canceled actions. Compound components combine counters by adding them together
and levels by taking their maximum value, as shown in Figure 2.11, “Syntax of
compound cost components”.


IMG.alt.suffix = \[Note]] Note

                          It is an error to add two levels, or to take the
                          maximum of two counters, or to combine levels and
                          counters in any way. For instance, the costs removals
                          + safety and max(upgrades, installs) will be treated
                          as errors and ignored by the resolver.[13]


Figure 2.11. Syntax of compound cost components

Add two or more basic costs:

                [scale1]*cost1 + [scale2]*cost2 + ...

Take the maximum value of two or more basic costs:

                max([scale1]*cost1, [scale2]*cost2, ...)



Note that each individual basic component can be multiplied by a scaling factor
before it is combined with other components. This can be used to control the
trade-offs that the resolver makes between costs. For instance, a cost of
2*removals + 3*upgrades says that three removals are exactly as “bad” as two
upgrades. Solutions that contain four removals and one upgrade will be
considered equivalent to solutions containing one removal and three upgrades,
since both have a cost of eleven.


Safety costs

Figure 2.12. Safety cost levels

IMG.alt.suffix = \Safety cost levels]

[Safety cost levels diagram]



The safety cost component is a heuristic estimate of how “safe” or “unsafe” a
solution is. Safety costs can be thought of as a way of dividing solutions into
several numbered “levels”, where “less safe” levels are given higher numbers.
Figure 2.12, “Safety cost levels” shows how this works with aptitude's default
settings.


IMG.alt.suffix Tip
  = \[Tip]]
               Safety cost levels are just one way to control the order in which dependency
               solutions are returned. See the section called “Costs in the interactive
               dependency resolver” for a full description of how to change the order in which
               aptitude sorts solutions.


By default, aptitude initializes the resolver with a “reasonable” set of safety
cost levels. They are:

Table 2.2. Default safety cost levels

 ______________________________________________________________________________________________________
|Cost  |Description                                                                  |Configuration    |
|level |                                                                             |option           |
|______|_____________________________________________________________________________|_________________|
|      |                                                                             |Aptitude::       |
|      |                                                                             |ProblemResolver::|
|10,000|Solutions that include only “safe” actions (installing the default target|Safe-Level,      |
|      |a package or keeping a package at its current version) and package removals. |Aptitude::       |
|      |                                                                             |ProblemResolver::|
|      |                                                                             |Remove-Level     |
|______|_____________________________________________________________________________|_________________|
|      |The solution that cancels all the user's actions. It used to be higher than  |Aptitude::       |
|10,000|Aptitude::ProblemResolver::Remove-Level, but removing packages was ranked    |ProblemResolver::|
|      |higher than keeping the same packages, even if the package was to be         |Keep-All-Level   |
|      |upgraded.                                                                    |                 |
|______|_____________________________________________________________________________|_________________|
|      |                                                                             |Aptitude::       |
|40,000|Solutions that break holds set by the user or install forbidden versions.    |ProblemResolver::|
|      |                                                                             |Break-Hold-Level |
|______|_____________________________________________________________________________|_________________|
|      |Solutions that install packages from non-default versions (such as           |Aptitude::       |
|50,000|“experimental”, for instance).                                           |ProblemResolver::|
|      |                                                                             |Non-Default-Level|
|______|_____________________________________________________________________________|_________________|
|      |                                                                             |Aptitude::       |
|60,000|Solutions that remove Essential packages.                                    |ProblemResolver::|
|      |                                                                             |Remove-Essential-|
|      |                                                                             |Level            |
|______|_____________________________________________________________________________|_________________|



If a solution qualifies for several safety cost levels, it will be placed in the
highest one, that is, the one that appears last. For example, a solution that
upgrades one package to its default version and breaks a hold on a second
package will be placed at level 40,000. You can adjust the levels of individual
versions using resolver hints; see the section called “Configuring resolver
hints” for details. The default levels are illustrated in Figure 2.12, “Safety
cost levels”.

Besides numbers you can also use the keywords “maximum” and “minimum” for cost
levels. They refer to the maximal respective minimal integer value possible on
the hardware architecture of your system.


Configuring the interactive dependency resolver


Configuring resolver hints

To improve the quality of the dependency solutions that you receive, you can
provide hints to the interactive dependency resolver. These hints can alter the
priorities of the resolver, biasing it more strongly in favor of one version or
package, or they can be used to “pre-load” the resolver with rejections and
approvals, as if you had entered the resolver and manually rejected or approved
various versions.

Hints are stored in the apt configuration file, /etc/apt/apt.conf, in the
configuration group “Aptitude::ProblemResolver::Hints” (see the section called
“Configuration file reference” for details on the configuration file).

Each resolver hint consists of an action, a target, and an optional version. A
hint is written like this: "action target [version]". To apply a resolver hint,
aptitude locates one or more packages using the value of target, chooses one or
more versions of those packages using the value of version, and finally performs
the given action.

The action field of a resolver hint may be one of the following:


  1. “approve”: Approve the version, as if the command Resolver → Toggle
     Approved (a) had been invoked on it.

  2. “reject”: Reject the version, as if the command Resolver → Toggle Rejected
     (r) had been invoked on it.

  3.  “discard”: Discard every solution containing the version. Differs from
     “reject” in that it is not visible to the user and cannot be modified
     interactively.

  4. “increase-safety-cost-to number”: increase the safety cost of any solution
     that contains the version to number; if its safety cost is already higher
     than number, this hint has no effect. The safety cost can be used (and is
     used by default) to control the order in which solutions appear; see the
     section called “Costs and cost components” and the section called “Safety
     costs” for details.

     Several special cost levels can be chosen by name:


       a. conflict, discard: instead of changing the safety cost, discard
          solutions containing the version as if the “discard” hint had been
          applied.

       b. maximum: the highest safety cost.

       c. minimum: the lowest safety cost. All searches start at this cost, so
          “increasing” a version to this cost has no effect. However, this value
          can also be used when adjusting the predefined cost levels: for
          instance, setting Aptitude::ProblemResolver::Remove-Level to “minimum”
          will cause removed packages to have no effect on the safety cost of a
          solution.



     IMG.alt.suffix Note
       = \[Note]]
                    The increase-safety-cost-to hint is applied in addition to any default
                    safety cost that is due to the selected action. For instance, a hint that
                    increases the safety cost of “install hal from experimental” to 15,000
                    will have no effect, because that action already has a safety cost of
                    50,000 (assuming that this version of hal is not the default candidate
                    version).


  5. “number”: add the given number to the version's score, biasing the resolver
     in favor of it or (with a negative number) away from it. For instance, the
     hint 200 emacs adds 200 to the score of emacs, whereas the hint -10 emacs
     subtracts 10 from its score.


If target field of a resolver hint contains a question mark (“?”) or tilde
(“~”), it is considered to be a search pattern and all matching package versions
are considered. Otherwise, it is considered to be the name of a package to
select. So the target “g++” will select only the g++ package, but the target
“?section(non-free)” will select any package in the non-free section. See the
section called “Search patterns” for more information on search patterns.

If the version field is not present, then all versions of the package are
affected by the hint. Otherwise, it may have any of the following forms:


  1. “/archive”: the hint only affects versions that are available in the given
     archive.

  2. “<version”: the hint only affects versions whose version number is less
     than version.

  3. “<=version”: the hint only affects versions whose version number is less
     than or equal to version.

  4. “=version”: the hint only affects versions whose version number is version.

  5. “<>version”: the hint only affects versions whose version number is not
     version.

  6. “>=version”: the hint only affects versions whose version number is greater
     than or equal to version.

  7. “>version”: the hint only affects versions whose version number is greater
     than version.

  8. “:UNINST”: instead of affecting any of the versions of target, the hint
     affects the decision to remove target. For instance, “Aptitude::
     ProblemResolver::Hints { "reject aptitude :UNINST"; };” will prevent the
     resolver from attempting to remove aptitude.

  9. “version”: the hint only affects versions whose version number is version.



Search patterns

When you search for a package or set a display limit in aptitude, the string you
enter is known as a “search pattern”. While the most basic usage of search
patterns is to match packages by name, aptitude allows you to create much more
complex searches. In addition to the visual interface, some command-line
operations can use search patterns; see Command-line reference for details.

A search pattern consists of one or more conditions (sometimes known as
“terms”); packages match the pattern if they match all of its terms. Terms
generally start with a question mark (“?”), followed by the name of the match
term, which describes the search that the term performs: for instance, the term
?name matches package names, while the term ?version matches package versions.
Finally, any additional parameters to the search term are placed in parentheses
(see the documentation of individual terms for details of what each term's
parameters mean).


IMG.alt.suffix Note
  = \[Note]]
               Text with no leading “?” also forms a search pattern: aptitude will treat each
               word (or quoted string) as the argument to a ?name pattern, which searches for a
               package whose name matches the text when the text is interpreted as a regular
               expression.



IMG.alt.suffix Warning
= \[Warning]]
               The behavior of aptitude when given a search pattern without a leading “?” (or “~”)
               is provided as a convenience for interactive use and will change in future
               releases; scripts that invoke aptitude should explicitly name the search strategy
               they want to use. That is, scripts should search for “?name(coq)” rather than
               “coq”).



Searching for strings

Many search terms take a string as a parameter and match it against one or more
fields of a package. Strings can be entered either with or without double quotes
(“"”), so “?name(scorch)” and “?name("scorch")” will perform the same search. If
you enter a search string using double quotes, you can include a literal double-
quote in the search string by placing a backslash (“\”) immediately before it:
for instance, “?description("\"easy\"")” will match any package whose
description contains the string “"easy"”.

If you enter a “bare” string, one not surrounded by double quotes, then aptitude
will consider the string to have “ended” when it encounters the closing
parenthesis or the comma before a second argument to the search term. [14] To
remove the special meaning of these characters, place a tilde (“~”) directly
before them. For instance, “?description(etc))” is a syntax error, because the
first “)” ends the ?description term, and the second “)” does not correspond to
any “(”. In contrast, “?description(etc~))” matches any package whose
description contains the text “etc)”. There are additional considerations if you
are using the shorthand notation for a term; see the section called “Shorthand
for search terms” for details.

Most textual searches (for package names, descriptions, etc) are performed using
case-insensitive regular expressions. A regular expression will match against a
field if any portion of the field matches the expression; for instance, “ogg[0-
9]” will match “libogg5”, “ogg123”, and “theogg4u”. Some characters have a
special meaning within regular expressions [15] , so if you want to match them
in searches you need to backslash-escape them: for instance, to find “g++”, you
should use the pattern “g\+\+”.

The characters “!” and “|” have special meanings within search patterns. In
order to include these characters in an unquoted string, you can place a tilde
(“~”) directly before them. For instance, to match packages whose description
contains either “grand” or “oblique”, use the pattern “?description
(grand~|oblique)”. However, you will probably find it more convenient to simply
use a quoted string in these cases: “?description("grand|oblique")”.


Shorthand for search terms

Some search terms can be written using “short” forms, which consist of a tilde
(“~”) followed by a single character that identifies the term, and finally the
arguments (if any) to the term. For instance, the short form of ?name(aptitude)
is ~n aptitude.

When writing a term using its short form, tilde characters and “whitespace” -
- that is, space characters, tabs, and so on -- will break the term off and
start a new term. For instance, “~mDaniel Burrows” will match any package whose
maintainer field contains “Daniel” and whose name contains “Burrows”, while
“~i~napt” matches installed packages whose name contains apt. To include
whitespace characters in the search expression, you can either place a tilde in
front of it (as in Daniel~ Burrows) or place quotation marks around it (as in
"Debian Project" or even Debian" "Project). Inside a quoted string, the
backslash character (“\”) can be used to cancel the special meaning of the
quotation mark: for instance, ~d"\"email" will match any package whose
description contains a quotation mark followed immediately by email. [16]


IMG.alt.suffix Note
  = \[Note]]
               Question marks (“?”) will not end the short form of a term, even if they are
               followed by the name of a search term. For instance, “~napt?priority(required)”
               will match all packages whose name matches the regular expression “apt?priority
               (required)”. To combine a short query term with a search term specified by name,
               add one or more spaces between the two terms, as in “~napt ?priority(required)”, or
               place quotation marks around the text (if any) following the short form of a term,
               as in “~n"apt"?priority(required)”.


Table 2.3, “Quick guide to search terms” lists the short form of each search
term.


Searches and versions

By default, a pattern matches a package if any version of the package matches
the pattern. However, some patterns will restrict their sub-patterns to only
match against some versions of a package. For instance, the search term ?depends
(pattern) will select any package that depends on a package matching pattern.
However, pattern will only be checked against the versions of the package that
actually satisfy a dependency. This means that if foo depends on bar (>= 3.0)
and versions 2.0, 3.0, and 4.0 of bar are available, then in the search pattern
?depends(?version(2\.0)), only versions 3.0 and 4.0 will be tested against
?version(2\.0), and hence foo will not be found by this search.

It matters which versions are checked because, as in the example above, some
patterns will match one version but not another. For instance, the pattern
?installed will only match the version of the package (if any) that is currently
installed. Similarly, the pattern ?maintainer(maintainer) will only match
versions that have the given maintainer. Normally all versions of a package have
the same maintainer, but this is not always the case; in fact, any search
pattern that examines the fields of a package (other than its name, of course)
will behave this way, because all the fields of a package can change between
versions.

To test a pattern against all the versions of a package, even if the pattern
would normally be tested against only some of the versions, use the ?widen term.
For instance, ?depends(?widen(?version(2\.0))) will match any package A that
depends on a package B, where B has a version matching 2.0, regardless of
whether that version actually satisfies A's dependency. On the other hand, the
?narrow term restricts the versions that its sub-pattern is matched against:
?narrow(?installed, ?depends(?version(ubuntu))) will match any package whose
installed version has a dependency that can be satisfied by a package whose
version string contains “ubuntu”.


IMG.alt.suffix = \[Note]] Note

                          There is a subtle, but important, distinction between
                          matching a pattern against a package, and matching it
                          against all the versions of that package. When a
                          pattern is matched against a package, each of its
                          terms is matched against the package, and so each term
                          will match if any version of the package matches. In
                          contrast, when a pattern is matched against each
                          version of a package, it will successfully match if it
                          matches when all its terms are matched against the
                          same version of the package.

                          For example: suppose that version 3.0-1 of the package
                          aardvark is installed, but that version 4.0-1 is
                          available. Then the search expression ?version(4\.0-
                          1)?installed matches aardvark, because ?version(4\.0-
                          1) matches against version 4.0-1 of aardvark, while
                          ?installed matches against version 3.0-1. On the other
                          hand, this expression does not match against all the
                          versions of aardvark, because no single version is
                          installed and also has a version number of 4.0-1.



Explicit search targets

Some particularly complex searches can be expressed in aptitude using explicit
targets. In normal search expressions, there is no way to refer to the package
or version that is currently being tested. For instance, suppose that you want
to search for all packages P that depend on a second package Q such that Q
recommends P. Clearly you need to start out with a ?depends(...) term. But the
term filling in the ... needs to somehow select packages that are identical to
the one being matched against ?depends. When describing the goal above, I dealt
with this by giving the packages names, calling them P and Q; terms with
explicit targets do exactly the same thing. [17]

An explicit target is introduced by the ?for term:

Figure 2.13. Syntax of the ?for term

?for variable: pattern



This behaves exactly like pattern, but variable can be used within pattern to
refer to the package or version that pattern is being matched against. You can
use variable in two ways:


  1. The term ?= will match exactly the package or version indicated by the
     given variable. Specifically: if the corresponding ?for term is limited to
     a particular version, then ?= will match either that version (if ?= is
     limited) or the whole package; otherwise it will match any version of the
     package.

     See Example 2.2, “ Use of the ?= term. ” for an example of how to use ?=.

  2. The term ?bind(variable, pattern) will match any package or version if the
     value of variable matches against pattern.

     For ?-style terms, a shorthand form is available. The expression ?bind
     (variable, ?term[(args)]) can be replaced by ?variable:term(args).

     See Example 2.3, “Use of the ?bind term” for an example of how to use
     ?bind.



Search term reference

Table 2.3, “Quick guide to search terms” provides a brief summary of all the
search terms provided by aptitude. A full description of each term can be found
below.

Table 2.3. Quick guide to search terms

 _____________________________________________________________________________________________________________
|Long form     |Short form    |Description                                                                    |
|______________|______________|_______________________________________________________________________________|
|?=variable    |             |Select the package bound to variable; see the section called “Explicit search|
|              |              |targets”.                                                                    |
|______________|______________|_______________________________________________________________________________|
|?not(pattern) |!pattern      |Select any package that does not match pattern.                                |
|______________|______________|_______________________________________________________________________________|
|?action       |~aaction      |Select packages that have been marked for the given action (e.g., “install”|or
|(action)      |              |“upgrade”).                                                                |
|______________|______________|_______________________________________________________________________________|
|?all-versions |             |Select packages whose versions all match pattern.                              |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?and(pattern1,|pattern1      |Select any package that matches both pattern1 and pattern2.                    |
|pattern2)     |pattern2      |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?any-version  |             |Select packages for which at least one version matches pattern.                |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?architecture |~rarchitecture|Select packages for the given architecture (such as “amd64”, or “all”).|Special
|(architecture)|              |values: native and foreign.                                                    |
|______________|______________|_______________________________________________________________________________|
|?archive      |~Aarchive     |Select packages from the given archive (such as “unstable”).               |
|(archive)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?automatic    |~M            |Select packages that were automatically installed.                             |
|______________|______________|_______________________________________________________________________________|
|?bind         |?variable:    |Selects anything if variable matches pattern; see the section called “Explici|
|(variable,    |term-name[    |search targets”.                                                             |
|pattern)      |(args)]       |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?broken       |~b            |Select packages that have a broken dependency.                                 |
|______________|______________|_______________________________________________________________________________|
|?broken-      |~BdepType     |Select package that have a broken dependency of the given depType.             |
|depType       |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?broken-      |~DB[depType:  |Select packages that have a broken dependency of the given depType matching    |
|depType       |]pattern      |pattern.                                                                       |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?broken-      |              |                                                                               |
|reverse-      |~RBdepType:   |Select packages that a package matching pattern declares a broken dependency of|
|depType       |pattern       |type depType.                                                                  |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?conflicts    |~Cpattern     |Select packages that conflict with a package matching pattern.                 |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?config-files |~c            |Select packages that were removed but not purged.                              |
|______________|______________|_______________________________________________________________________________|
|?depType      |~D[depType:   |Match packages that declare a dependency of type depType on a package matching |
|(pattern)     |]pattern      |pattern.                                                                       |
|______________|______________|_______________________________________________________________________________|
|?description  |~ddescription |Select packages whose description matches description.                         |
|(description) |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?essential    |~E            |Select essential packages, those with Essential: yes in their control files.   |
|______________|______________|_______________________________________________________________________________|
|?exact-name   |             |Select packages named name.                                                    |
|(name)        |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?false        |~F            |Select no packages.                                                            |
|______________|______________|_______________________________________________________________________________|
|?for variable:|             |Select packages that match pattern with variable bound to the package being    |
|pattern       |              |matched; see the section called “Explicit search targets”.                 |
|______________|______________|_______________________________________________________________________________|
|?garbage      |~g            |Select packages that are not required by any manually installed package.       |
|______________|______________|_______________________________________________________________________________|
|?installed    |~i            |Select installed packages.                                                     |
|______________|______________|_______________________________________________________________________________|
|?maintainer   |~mmaintainer  |Select packages maintained by maintainer.                                      |
|(maintainer)  |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?multiarch    |             |Select packages with a multi-arch capability of multiarch (that is, either     |
|(multiarch)   |              |“foreign”, “same”, “allowed”, or “none”).                      |
|______________|______________|_______________________________________________________________________________|
|?narrow       |~S filter     |                                                                               |
|(filter,      |pattern       |Select packages for which a single version matches both filter and pattern.    |
|pattern)      |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?name(name)   |~nname, name  |Select packages with the given name.                                           |
|______________|______________|_______________________________________________________________________________|
|?new          |~N            |Select new packages.                                                           |
|______________|______________|_______________________________________________________________________________|
|?obsolete     |~o            |Match installed packages that cannot be downloaded.                            |
|______________|______________|_______________________________________________________________________________|
|?or(pattern1, |pattern1 |    |Select packages that match pattern1, pattern2, or both.                        |
|pattern2)     |pattern2      |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?origin       |~Oorigin      |Select packages with the given origin.                                         |
|(origin)      |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?provides     |~Ppattern     |Select packages that provide a package matching pattern.                       |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?priority     |~ppriority    |Select packages with the given priority.                                       |
|(priority)    |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?reverse-     |~R[depType:   |Select packages that are the targets of a dependency of type depType declared  |
|depType       |]pattern      |by a package matching pattern.                                                 |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?reverse-     |~RBdepType:   |Select packages that are the targets of a broken dependency of type depType    |
|broken-depType|pattern       |declared by a package matching pattern.                                        |
|(pattern)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?section      |~ssection     |Select packages in the given section.                                          |
|(section)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?source-      |~ename        |Select packages whose source package name matches the regular expression name. |
|package(name) |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?source-      |              |                                                                               |
|version       |             |Select packages whose source version matches the regular expression version.   |
|(version)     |              |                                                                               |
|______________|______________|_______________________________________________________________________________|
|?tag(tag)     |~Gtag         |Select packages that have the given debtags tag.                               |
|______________|______________|_______________________________________________________________________________|
|?term(keyword)|             |Full-text search for packages that contain the given keyword.                  |
|______________|______________|_______________________________________________________________________________|
|?term-prefix  |             |Full-text search for packages that contain a keyword that begins with the given|
|(keyword)     |              |keyword.                                                                       |
|______________|______________|_______________________________________________________________________________|
|?true         |~T            |Select all packages.                                                           |
|______________|______________|_______________________________________________________________________________|
|?task(task)   |~ttask        |Select packages that are in the given task.                                    |
|______________|______________|_______________________________________________________________________________|
|?upgradable   |~U            |Select packages that are installed and can be upgraded.                        |
|______________|______________|_______________________________________________________________________________|
|?user-tag     |             |Select packages that are marked with a user-tag matching the regular expression|
|              |              |user-tag.                                                                      |
|______________|______________|_______________________________________________________________________________|
|?version      |~Vversion     |Select packages whose version matches version (special values: CURRENT,        |
|(version)     |              |CANDIDATE, and TARGET).                                                        |
|______________|______________|_______________________________________________________________________________|
|?virtual      |~v            |Select virtual packages.                                                       |
|______________|______________|_______________________________________________________________________________|
|?widen        |~Wpattern     |Select versions for which pattern matches any version of the corresponding     |
|(pattern)     |              |package, discarding local version restrictions.                                |
|______________|______________|_______________________________________________________________________________|





  name
      Matches packages whose names match the regular expression name. This is
      the “default” search mode and is used for patterns that don't start with
      ~.


      IMG.alt.suffix Note
        = \[Note]]
                     To match packages whose names contain several different substrings, use the
                     ?name term (described below); for instance, “?name(apti)?name(tude)” will
                     match any package whose name contains both “apti” and “tude”.



  ?=variable
      Matches packages that correspond to the value of variable, which must be
      bound by an enclosing ?for. For instance, ?for x: ?depends( ?recommends
      ( ?=x ) ) will match any package x that depends on a package which
      recommends x.

      For instance, the following search expression matches packages that
      conflict with themselves:

      Example 2.2.  Use of the ?= term.

      ?for x: ?conflicts(?=x)


      See the section called “Explicit search targets” for more information.


  ?not(pattern), !pattern
      Matches packages which do not match the pattern pattern. For instance,
      “?not(?broken)” selects packages that are not “broken”.


      IMG.alt.suffix Note
        = \[Note]]
                     To include a “!” in a search string, it must be “escaped” by placing a tilde
                     (“~”) in front of it; otherwise, aptitude will consider it to be part of a
                     ?not term. For instance, to select packages whose description contains
                     “extra!”, use “?description(extra~!)”.



  ?and(pattern1, pattern2), pattern1 pattern2
      Matches packages that match both pattern1 and pattern2.


  ?or(pattern1, pattern2), pattern1 | pattern2
      Matches packages that match either pattern1 or pattern2.


      IMG.alt.suffix Note
        = \[Note]]
                     To use the character “|” in a regular expression, it must be “escaped” to prevent
                     aptitude from creating an OR term from it: “~|”.



  (pattern)
      Matches pattern. For instance, “opengl (perl|python)” matches any package
      whose name contains opengl, and also contains either perl or python.


  ?action(action), ~aaction
      Matches packages upon which the given action is going to be performed.
      action can be “install”, “upgrade”, “downgrade”, “remove”, “purge”, “hold”
      (tests whether a package has been placed on hold), or “keep” (tests
      whether a package will be unchanged).


      IMG.alt.suffix = \[Note]] Note

                                Note that this only tests whether an action is
                                actually queued up to be performed on a package,
                                not whether it could be performed. Thus, for
                                instance, ?action(upgrade) matches exactly those
                                packages that you have already decided to
                                upgrade, not packages which could be upgraded in
                                the future (for that, use ?upgradable).



  ?all-versions(pattern)
      Matches any package whose versions all match the given expression. Each
      version of a package will be separately tested against pattern, and the
      package will match if all of its versions match. Packages without
      versions, such as virtual packages, will always be matched by this search
      term.

      This term may not be used in a context in which the versions to match
      against have already been narrowed, such as within ?depends or ?narrow.
      However, it may always be used within ?widen.


  ?any-version(pattern)
      Matches a package if any one of its versions matches the enclosed pattern.
      This is the dual to ?all-versions.

      This term may not be used in a context in which the versions to match
      against have already been narrowed, such as within ?depends or ?narrow.
      However, it may always be used within ?widen.


      IMG.alt.suffix = \[Note]] Note

                                This term is closely related to ?narrow. In
                                fact, ?any-version(pattern1 pattern2) is exactly
                                the same as ?narrow(pattern1, pattern2).



      IMG.alt.suffix Note
        = \[Note]]
                     To be precise, as with any other pattern, it is not packages but versions of
                     the packages which are matched. For “aptitude search” and other uses it does
                     not make much difference, but “aptitude versions” will only show the
                     versions that match, not all versions of the package for which any version
                     matches. For that, use an enclosing ?widen.



  ?architecture(architecture-spec), ~rarchitecture-spec
      Matches package versions for the given architecture-spec. For instance,
      “?architecture(amd64)” matches amd64 packages, while “?architecture(all)”
      matches arch-independent packages.

      It also accepts the special values native and foreign, and architecture
      wildcards (e.g. linux-any or any-amd64), as specified in Policy (“11.1
      Architecture specification strings”).


  ?archive(archive), ~Aarchive
      Matches package versions which are available from an archive that matches
      the regular expression archive. For instance, “?archive(testing)” matches
      any package available from the testing archive.


  ?automatic, ~M
      Matches packages which were automatically installed.


   ?bind(variable, pattern), ?variable:term-name[(args)]
      Matches any package or version if the given pattern matches the package or
      version bound to variable, which must be defined in an enclosing ?for.

      Example 2.3. Use of the ?bind term

      ?for x: ?depends(?depends(?for z: ?bind(x, ?depends(?=z))))

      ?for x: ?depends(?depends(?for z: ?x:depends(?=z)))


      The two search patterns in the above example both match any package x such
      that x depends on a package y which in turn depends on a package z such
      that x also depends directly on z. The first pattern uses ?bind directly,
      while the second one uses an equivalent shorthand syntax.

      See the section called “Explicit search targets” for more information.


  ?broken, ~b
      Matches packages that are “broken”: they have an unfulfilled dependency,
      predependency, breaks, or conflict.


  ?broken-depType, ~BdepType
      Matches packages which have an unfulfilled (“broken”) dependency of the
      given depType. depType can be “depends”, “predepends”, “recommends”,
      “suggests”, “breaks”, “conflicts”, or “replaces”.


  ?broken-depType(pattern), ~DB[depType:]pattern
      Matches packages with an unsatisfied dependency of type depType on a
      package matching pattern. depType may be any one of the dependency types
      listed in the documentation of ?broken-depType.


  ?conflicts(pattern), ~Cpattern
      Matches packages which conflict with a package matching the given pattern.
      For instance, “?conflicts(?maintainer(dburrows@debian.org))” matches any
      package which conflicts with a package I maintain.


  ?config-files, ~c
      Matches packages which have been removed, but whose configuration files
      remain on the system (ie, they were removed but not purged).


  ?depType(pattern), ~D[depType:]pattern
      depType may be any one of the dependency types given in the documentation
      of ?broken-depType, as well as provides: for instance, ?depends(libpng3)
      will match any package that depends on libpng3. If the short form (~D) is
      used and depType is not present, it defaults to depends.

      If depType is “provides”, matches packages that provide a package matching
      pattern (the equivalent of ?provides). Otherwise, matches packages which
      declare a dependency of type depType upon a package version which matches
      pattern.


  ?description(description), ~ddescription
      Matches packages whose description matches the regular expression
      description.


  ?essential, ~E
      Matches Essential packages.


  ?exact-name(name)
      Matches packages named name. This is similar to ?name, but the name must
      match exactly. For instance, the following pattern will match only the
      package apt; with ?name, it would also match aptitude, uvccapture, etc.

      Example 2.4. Use of the ?exact-name term

      ?exact-name(apt)



  ?false, ~F
      This term does not match any package. [18]


  ?for variable: pattern
      Matches pattern, but the given variable may be used inside pattern to
      refer to the package or package version this term to.

      You can use variable in two ways. To apply a ?-style term to the variable,
      write ?variable:term-name(args); for instance, ?x:depends(apt). In
      addition, the term ?=variable will select any package or version that
      matches the value of the given variable.

      For instance, the following term will match any package x that both
      depends and recommends a second package y.

      Example 2.5. Use of the ?for term

      ?for x: ?depends( ?for y: ?x:recommends( ?=y ) )


      See the section called “Explicit search targets” for more information.


  ?garbage, ~g
      Matches packages which are not installed, or which were automatically
      installed and are not depended upon by any installed package.


  ?installed, ~i
      Matches package versions which are currently installed.

      Since all versions are tested by default, this normally matches packages
      which are currently installed.


  ?maintainer(maintainer), ~mmaintainer
      Matches packages whose Maintainer field matches the regular expression
      maintainer. For instance, “?maintainer(joeyh)” will find all packages
      maintained by Joey Hess.


  ?multiarch(multiarch)
      Matches packages with the multi-arch capability specified by multiarch.
      For instance, “?multiarch(foreign)” will find all packages which can
      satisfy dependencies of packages for another architecture. “?multiarch
      (none)” will select packages with no multi-arch capability.


   ?narrow(filter, pattern), ~S filter pattern
      This term “narrows” the search to package versions matching filter. In
      particular, it matches any package version which matches both filter and
      pattern. The string value of the match is the string value of pattern.


  ?name(name), ~nname
      Matches packages whose name matches the regular expression name. For
      instance, most of the packages that match “?name(^lib)” are libraries of
      one sort or another.


  ?new, ~N
      Matches packages which are “new”: that is, they have been added to the
      archive since the last time the list of packages was cleared using Actions
      → Forget new packages (f) or the command-line action forget-new.


   ?obsolete, ~o
      This term matches any installed package which is not available in any
      version from any archive. These packages appear as “Obsolete or Locally
      Installed” in the visual interface.


  ?origin(origin), ~Oorigin
      Matches package versions whose origin matches the regular expression
      origin. For instance, “!?origin(debian)” will find any unofficial packages
      on your system (packages not from the Debian archive).


  ?provides(pattern), ~Ppattern
      Matches package versions which provide a package that matches the pattern.
      For instance, “?provides(mail-transport-agent)” will match all the
      packages that provide “mail-transport-agent”.


  ?priority(priority), ~ppriority
      Matches packages whose priority is priority; priority must be extra,
      important, optional, required, or standard. For instance, “?priority
      (required)” matches packages whose priority is “required”.


  ?reverse-depType(pattern), ~R[depType:]pattern
      depType may be either “provides” or one of the dependency types given in
      the documentation of ?broken-depType. If depType is not present, it
      defaults to depends.

      If depType is “provides”, matches packages whose name is provided by a
      package version matching pattern. Otherwise, matches packages which a
      package version matching pattern declares a dependency of type depType
      upon.


  ?reverse-broken-depType(pattern), ?broken-reverse-depType(pattern), ~RB
  [depType:]pattern
      depType may be either “provides” or one of the dependency types given in
      the documentation of ?broken-depType. If depType is not present, it
      defaults to depends.

      Matches packages which a package version matching pattern declares an
      unsatisfied dependency of type depType upon.


   ?section(section), ~ssection
      Matches packages whose section matches the regular expression section.


   ?source-package(name), ~ename
      Matches packages whose source package name matches the regular expression
      name.


   ?source-version(version)
      Matches packages whose source version matches the regular expression
      version.


  ?tag(tag), ~Gtag
      Matches packages whose Tag field matches the regular expression tag. For
      instance, the pattern ?tag(game::strategy) would match strategy games.

      For more information on tags and debtags, see http://
      debtags.alioth.debian.org.


   ?task(task), ~ttask
      Matches packages that appear in a task whose name matches the regular
      expression task.


   ?term(keyword)
      This term performs a full-text search for keyword in the apt package
      cache. When used with “aptitude search”, Search → Limit Display (l) in the
      curses front-end, or typed into a package search box in the GTK+ front-
      end, this term will allow aptitude to accelerate the search using a Xapian
      index.


   ?term-prefix(keyword)
      This term performs a full-text search for any keyword beginning with
      keyword in the apt package cache. When used with “aptitude search”, Search
      → Limit Display (l) in the curses front-end, or typed into a package
      search box in the GTK+ front-end, this term will allow aptitude to
      accelerate the search using a Xapian index.

      This is similar to ?term, but matches extensions of the keyword. For
      instance, the following search pattern will match any package indexed
      under the keywords hour, hourglass, hourly, and so on:

      Example 2.6. Use of the ?term-prefix term

      ?term-prefix(hour)



   ?true, ~T
      This term matches any package. For instance, “?installed?provides(?true)”
      matches installed packages which provide any package.


   ?upgradable, ~U
      This term matches any installed package which can be upgraded.


      IMG.alt.suffix = \[Note]] Note

                                Note that this only tests whether there are
                                upgrades available for a package, not whether an
                                upgrade could be performed (with actions such as
                                safe-upgrade or full-upgrade).

                                For instance, there can be upgrades available
                                for several packages, but maybe the upgraded
                                versions of a subset conflict with each other,
                                so they cannot be co-installed or not all of
                                them upgraded at the same time.



   ?user-tag(tag)
      This term matches any package that is marked with a user-tag matching the
      regular expression tag.


   ?version(version), ~Vversion
      Matches any package version whose version number matches the regular
      expression version, with the exceptions noted below. For instance,
      “?version(debian)” matches packages whose version contains “debian”.

      The following values of version are treated specially. To search for
      version numbers containing these values, preface the value with a
      backslash; for instance, to find packages whose version number contains
      CURRENT, search for \CURRENT.


      * CURRENT matches the currently installed version of a package, if any.

      * CANDIDATE matches the version, if any, of the package that will be
        installed if you press + on the package or run aptitude install on it.

      * TARGET matches the version of a package that is currently targeted for
        installation, if any.



   ?virtual, ~v
      Matches any package which is purely virtual: that is, its name is provided
      by a package, but no package of that name exists. For instance,
      “?virtual?reverse-provides(?installed)” matches virtual packages which are
      provided by any installed package.


   ?widen(pattern), ~Wpattern
      “Widens” the match: if the versions to match against have been limited by
      an enclosing term (such as ?depends), these limits are dropped. Thus,
      ?widen(pattern) matches a package version if pattern matches any version
      of that package.



Customizing aptitude


Customizing the package list

The package list can be heavily customized: how packages are displayed, how the
package hierarchy is formed, how packages are sorted, and even how the display
is organized are all open to change.


Customizing how packages are displayed

This section describes how to configure the contents and format of the package
list, status line, and header line, as well as the output of aptitude search.

The format of each of these locations is defined by a “format string”. A format
string is a string of text containing %-escapes such as %p, %S, and so on. The
resulting output is created by taking the text and replacing the %-escapes
according to their meanings (given below).

A %-escape can either have a fixed size, in which case it is always replaced by
the same amount of text (with extra space characters added to fill it out as
necessary), or it can be “expandable”, meaning that it takes up the space that
is not claimed by fixed-size columns. If there are several expandable columns,
the extra space is divided evenly between them.

All %-escapes come with a default size and/or expandability. The size of a %-
escape can be changed by writing it between the % and the character identifying
the escape; for instance, %20V generates the candidate version of the package,
20 characters wide. Placing a question mark (?) between the % and the character
identifying the escape causes the column's “basic” width to vary depending on
its content. Note that the resulting columns might not line up vertically!

If you want a particular %-escape to be expandable, even though it normally has
a fixed width, place a pound sign (ie, “#”) immediately after it. For instance,
to display the candidate version of a package, no matter how long it is, use the
format string %V#. You can also place # after something that is not a %-escape;
aptitude will “expand” the text preceding the # by inserting extra spaces after
it.

In summary, the syntax of a %-escape is:

%[width][?]code[#]

The configuration variables Aptitude::UI::Package-Display-Format, Aptitude::UI::
Package-Header-Format, and Aptitude::UI::Package-Status-Format define the
default formats the package list, the header at the top of the package list, and
the status line below the package list respectively. To change how the results
of an aptitude search command are displayed, use the -F option.

The following %-escapes are available in format strings:


IMG.alt.suffix Note
  = \[Note]]
               Some of the descriptions below refer to “the package”. In the GUI, this is
               either the package being displayed or the currently selected package; in the
               command-line search, this is the package being displayed.



Escape   Name         Default size                Expandable Description

%%       Literal %    1                           No         This is not really an escape; it simply inserts a percent sign into the output at
                                                             the point at which it occurs.

                                                             In some circumstances, a display format string will have “parameters”: for
%#number Parameter    Variable                    No         instance, in the command-line search, the groups matched by the search are used
         Replacement                                         as parameters when displaying the result. This format code will be replaced by
                                                             the parameter indicated by number.

%a       Action Flag  1                           No         A single-character flag summarizing any action to be performed on the package, as
                                                             described in Figure 2.10, “Values of the “action” flag”.

%A       Action       10                          No         A somewhat more verbose description of the action to be performed on the package.

%B       Broken Count 12                          No         If there are no broken packages, produces nothing. Otherwise, produces a string
                                                             such as “Broken: 10” describing the number of broken packages.

%c       Current      1                           No         A single-character flag summarizing the current state of the package, as
         State Flag                                          described in Figure 2.9, “Values of the “current state” flag”.

%C       Current      11                          No         A more verbose description of the current state of the package.
         State

%d       Description  40                          Yes        The package's short description.

%D       Package Size 8                           No         The size of the package file containing the package.

%E       Architecture 10                          No         Outputs the string of the architecture, for example “amd64”.

%e       Source       30                          No         Outputs the source package, for example “aptitude” for “aptitude-doc-en”.

%H       Hostname     15                          No         The name of the computer on which aptitude is running.

                                                             Displays the highest priority assigned to a package version; for packages,
%i       Pin priority 4                           No         displays the priority of the version which will be forced to be installed (if
                                                             any).

%I       Installed    8                           No         The (estimated) amount of space the package takes up on disk.
         Size

%m       Maintainer   30                          Yes        The maintainer of the package.

%M       Automatic    1                           No         If the package is automatically installed, outputs “A”; otherwise, outputs
         Flag                                                nothing.

%n       Program      The length of “0.8.10”. No         Outputs the version of aptitude that is running, currently “0.8.10”.
         Version

%N       Program Name The length of the name.     No         Outputs the name of the program; usually “aptitude”.

         Download                                            If no packages are going to be installed, outputs nothing. Otherwise, outputs a
%o       Size         17                          No         string describing the total size of all the package files which will be installed
                                                             (an estimate of how much needs to be downloaded); for instance, “DL size: 1000B”.

%O       Origin       30                          No         Outputs a string of the origin of the package, for example “Debian:unstable
                                                             [amd64]”.

                                                             Outputs the name of the package. When a package is displayed in a tree context,
%p       Package Name 30                          Yes        the name of the package will be indented, if possible, according to its depth in
                                                             the tree.

%P       Priority     9                           No         Outputs the priority of the package.

         Reverse                                             Outputs the approximate number of installed packages which depend upon the
%r       Depends      2                           No         package.
         Count

%R       Abbreviated  3                           No         Outputs an abbreviated description of the package's priority: for instance,
         Priority                                            “Important” becomes “Imp”.

%s       Section      10                          No         Outputs the section of the package.

%S       Trust Status 1                           No         If the package is untrusted, displays the letter "U".

%t       Archive      10                          Yes        The archive in which the package is found.

         Tagged (and                                         Outputs “*” if the package is tagged, nothing otherwise.[19]
%T       user-tags)   30                          No
                                                             This field also includes user-tags.

         Disk Usage                                          If the scheduled actions will alter the amount of space used on the disk, outputs
%u       Change       30                          No         a description of the change in disk space; for instance, “Will use 100MB of disk
                                                             space.”

%v       Current      14                          No         Outputs the currently installed version of the package, or <none> if the package
         Version                                             is not currently installed.

         Candidate                                           Outputs the version of the package which would be installed if Package → Install
%V       Version      14                          No         (+) were issued on the package, or <none> if the package is not currently
                                                             available.

%Z       Size Change  9                           No         Outputs how much additional space will be used or how much space will be freed by
                                                             installing, upgrading, or removing a package.



Customizing the package hierarchy

The package hierarchy is generated by a grouping policy: rules describing how
the hierarchy should be built. The grouping policy describes a “pipeline” of
rules; each rule can discard packages, create sub-hierarchies in which packages
reside, or otherwise manipulate the tree. The configuration items Aptitude::UI::
Default-Grouping and Aptitude::UI::Default-Preview-Grouping set the grouping
policies for newly created package lists and preview screens, respectively. You
can set the grouping policy for the current package list by pressing G.

The grouping policy is described by a comma-separated list of rules:
rule1,rule2,.... Each rule consists of the name of the rule, possibly followed
by arguments: for instance, versions or section(subdir). Whether arguments are
required and how many arguments are required (or allowed) depends on the type of
rule.

Rules can be non-terminal or terminal. A non-terminal rule will process a
package by generating some part of the hierarchy, then passing the package on to
a later rule. A terminal rule, on the other hand, will also generate part of the
tree (typically items corresponding to the package), but does not pass its
package to a later rule. If no terminal rule is specified, aptitude will use the
default rule, which is to create the standard “package items”.



  action

      Groups packages according to the action scheduled on them; packages that
      are not upgradable and will be unchanged are ignored. This is the grouping
      that is used in preview trees.


  architecture

      Groups packages according to their architecture.


  deps

      This is a terminal rule.

      Creates standard package items which can be expanded to reveal the
      dependencies of the package.


  filter(pattern)

      Include only packages for which at least one version matches pattern.

      If pattern is “missing”, no packages are discarded. This is a backwards
      compatibility feature and may be removed in the future.


  firstchar[(mode)]

      Groups packages based on the first character of their name.

      To be precise, it is not always the first letter -- for packages starting
      with lib* the name of the group is liba, libb, ... like in Debian FTPs.

      mode can be one of the following:



        binary
            Group based on the binary package name. This is the default if no
            mode is specified.

            Example 2.7. Grouping policy firstchar or firstchar(binary)

            With the source package dpkg as an example, the binary packages
            dselect, dpkg and dpkg-dev would be grouped under d, while libdpkg-
            dev and libdpkg-perl would be added to the libd group.



        source
            Group based on the source package name.

            This is useful for example when browsing packages coming from the
            same source package (source grouping policy) within large
            collections (examples: all installed packages, all upgradable
            packages, all packages from "main" section), to add an intermediate
            grouping step. In this way, one can for example emulate the
            hierarchy of FTPs (try grouping: "section(topdir),firstchar
            (source),source").

            Example 2.8. Grouping policy firstchar(source)

            Again, with the source package dpkg as an example, all the binary
            packages dselect, dpkg, dpkg-dev, libdpkg-dev and libdpkg-perl would
            be grouped under d.




  pattern(pattern [=> title] [{ policy }] [, ...])

      A customizable grouping policy. Each version of every package is matched
      against the given patterns. The first match found is used to assign a
      title to the package; packages are then grouped by their title. Strings of
      the form \N that occur in title will be replaced by the Nth result of the
      match. If title is not present, it is assumed to be \1. Note that packages
      which do not match any patterns will not appear in the tree at all.

      Example 2.9. Use of pattern to group packages by their maintainer

      pattern(?maintainer() => \1)


      The example above will group packages according to their Maintainer field.
      The policy pattern(?maintainer()) will do the same thing, as the absent
      title defaults to \1.

      Instead of => title, an entry may end with ||. This indicates that
      packages matching the corresponding pattern will be inserted into the tree
      at the same level as the pattern grouping, rather than being placed in
      subtrees.

      Example 2.10.  Use of pattern with some packages placed at the top level

      pattern(?action(remove) => Packages Being Removed, ?true ||)


      The example above will place packages that are being removed into a
      subtree, and place all the other packages at the current level, grouped
      according to the policies that follow pattern.

      By default, all the packages that match each pattern are grouped according
      to the rules that follow the pattern policy. To specify a different policy
      for some packages, write the policy in braces ({}) after the title of the
      group, after the ||, or after the pattern if neither is present. For
      instance:

      Example 2.11.  Use of the pattern grouping policy with sub-policies

      pattern(?action(remove) => Packages Being Removed {}, ?action(install) =>
      Packages Being Installed, ?true || {status})


      The policy in the above example has the following effects:


      * Packages that are being removed are placed into a subtree labeled
        “Packages Being Removed”; the grouping policy for this subtree is empty,
        so the packages are placed into a flat list.

      * Packages that are being installed are placed into a subtree labeled
        Packages Being Installed and grouped according to the policies that
        follow pattern.

      * All remaining packages are placed at the top level of the tree, grouped
        according to their status.


      See the section called “Search patterns” for more information on the
      format of pattern.


  priority

      Groups packages according to their priority.


  section[(mode[,passthrough])]

      Groups packages according to their Section field.

      mode can be one of the following:



        none
            Group based on the whole Section field, so categories like “non-
            free/games” will be created. This is the default if no mode is
            specified.


        topdir
            Group based on the part of the Section field before the first /
            character; if this part of the Section is not recognized, or if
            there is no /, the first entry in the list Aptitude::Sections::Top-
            Sections will be used instead.


        subdir
            Group based on the part of the Section field after the first /
            character, if it is contained in the list Aptitude::Sections::Top-
            Sections. If not, or if there is no /, group based on the entire
            Section field instead.


        subdirs
            Group based on the part of the Section field after the first /
            character, if the portion of the field preceding it is contained in
            the list Aptitude::Sections::Top-Sections; if not, or if there is no
            /, the entire field will be used. If there are multiple / characters
            in the portion of the field that is used, a hierarchy of groups will
            be formed. For instance, if “games” is not a member of Aptitude::
            Sections::Top-Sections, then a package with a section of “games/
            arcade” will be placed under the top-level heading “games”, in a
            sub-tree named “arcade”.


      If passthrough is present, packages which for some reason lack a true
      Section (for instance, virtual packages) will be passed directly to the
      next level of grouping without first being placed in sub-categories.


  status

      Groups packages into the following categories:


      * Security Updates

      * Upgradable

      * New

      * Installed

      * Not Installed

      * Obsolete and Locally Created

      * Virtual



  source

      Groups packages according to their source package name.


  tag[(facet)]

      Groups packages according to the Tag information stored in the Debian
      package files. If facet is provided, then only tags corresponding to that
      facet will be displayed, and packages lacking this facet will be hidden;
      otherwise, all packages will be displayed at least once (with tagless
      packages listed separately from packages that have tags).

      For more information on debtags, see http://debtags.alioth.debian.org.


  task

      Creates a tree called “Tasks” which contains the available tasks
      (information on tasks is read from debian-tasks.desc in the package
      tasksel). The rule following task will create its categories as siblings
      of Tasks.


  versions

      This is a terminal rule.

      Creates standard package items which can be expanded to reveal the
      versions of the package.



Customizing how packages are sorted

By default, packages in the package list or in the output of aptitude search are
sorted by name. However, it is often useful to sort them according to different
criteria (for instance, package size), and aptitude allows you to do just that
by modifying the sorting policy.

Like the grouping policy described in the previous section, the sorting policy
is a comma-separated list. Each item in the list is the name of a sorting rule;
if packages are “equal” according to the first rule, the second rule is used to
sort them, and so on. Placing a tilde character (~) in front of a rule reverses
the usual meaning of that rule. For instance, priority,~name will sort packages
by priority, but packages with the same priority will be placed in reverse order
according to name.

To change the sorting policy for an active package list, press S. To change the
default sorting for all package lists, set the configuration option Aptitude::
UI::Default-Sorting. To change the sorting policy for aptitude search, use the -
-sort command-line option.

The available rules are:



  installsize
      Sorts packages by the estimated amount of size they require when
      installed.


  installsizechange
      Sorts packages by the change in the installed size (estimated amount of
      size required when installed), comparing the current version (if
      installed) and the candidate version to be installed, upgraded or removed.


  debsize
      Sorts packages by the size of the package.


  name
      Sorts packages by name.


  priority
      Sorts packages by priority.


  version
      Sorts packages according to their version number.



Customizing keybindings

The keys used to activate commands in aptitude can be customized in the
configuration file. Every command has an associated configuration variable under
Aptitude::UI::Keybindings; to change the keystroke bound to a command, just set
the corresponding variable to the keystroke. For instance, to make the key s
perform a search, set Aptitude::UI::Keybindings::Search to “s”. You can require
the Control key to be pressed by placing “C-” in front of the key: for instance,
using “C-s” instead of “s” would bind Search to Control+s instead of s. Finally,
you can bind a command to several keys at once using a comma-separated list: for
instance, using “s,C-s” would cause both s and Control+s to perform a search.

The following commands can be bound to keys by setting the variable Aptitude::
UI::Keybindings::command, where command is the name of the command to be bound:

 ___________________________________________________________________________________________________________________
|Command               |Default     |Description                                                                    |
|______________________|____________|_______________________________________________________________________________|
|ApplySolution         |!           |If packages are broken and aptitude has suggested a solution to the problem,   |
|                      |            |immediately apply the solution.                                                |
|______________________|____________|_______________________________________________________________________________|
|Begin                 |home,C-a    |Move to the beginning of the current display: to the top of a list, or to the  |
|                      |            |left of a text entry field.                                                    |
|______________________|____________|_______________________________________________________________________________|
|Cancel                |C-          |Cancels the current interaction: for instance, discards a dialog box or        |
|                      |g,escape,C-[|deactivates the menu.                                                          |
|______________________|____________|_______________________________________________________________________________|
|Changelog             |C           |Displays the changelog.Debian of the currently selected package or package     |
|                      |            |version.                                                                       |
|______________________|____________|_______________________________________________________________________________|
|ChangePkgTreeGrouping |G           |Changes the grouping policy of the currently active package list.              |
|______________________|____________|_______________________________________________________________________________|
|ChangePkgTreeLimit    |l           |Changes the limit of the currently active package list.                        |
|______________________|____________|_______________________________________________________________________________|
|ChangePkgTreeSorting  |S           |Changes the sorting policy of the currently active package list.               |
|______________________|____________|_______________________________________________________________________________|
|ClearAuto             |m           |Marks the currently selected package as having been manually installed.        |
|______________________|____________|_______________________________________________________________________________|
|CollapseAll           |]           |Collapses the selected tree and all its children in a hierarchical list.       |
|______________________|____________|_______________________________________________________________________________|
|CollapseTree          |left        |Collapses the selected tree in a hierarchical list.                            |
|______________________|____________|_______________________________________________________________________________|
|Confirm               |enter       |In dialog boxes, this is equivalent to pressing “Ok”; when interacting with|a
|                      |            |status-line multiple choice question, it chooses the default option.           |
|______________________|____________|_______________________________________________________________________________|
|Cycle                 |tab         |Switches the keyboard focus to the next “widget”.                          |
|______________________|____________|_______________________________________________________________________________|
|CycleNext             |f6          |Switches to the next active view.                                              |
|______________________|____________|_______________________________________________________________________________|
|CycleOrder            |o           |Cycles through predefined arrangements of the display.                         |
|______________________|____________|_______________________________________________________________________________|
|CyclePrev             |f7          |Switches to the previous active view.                                          |
|______________________|____________|_______________________________________________________________________________|
|DelBOL                |C-u         |Deletes all text between the cursor and the beginning of the line.             |
|______________________|____________|_______________________________________________________________________________|
|DelBack               |backspace,C-|Deletes the previous character when entering text.                             |
|                      |h           |                                                                               |
|______________________|____________|_______________________________________________________________________________|
|DelEOL                |C-k         |Deletes all text from the cursor to the end of the line.                       |
|______________________|____________|_______________________________________________________________________________|
|DelForward            |delete,C-d  |Deletes the character under the cursor when entering text.                     |
|______________________|____________|_______________________________________________________________________________|
|Dependencies          |d           |Displays the dependencies of the currently selected package.                   |
|______________________|____________|_______________________________________________________________________________|
|DescriptionCycle      |i           |When browsing the package list, cycles through the available views in the      |
|                      |            |information area.                                                              |
|______________________|____________|_______________________________________________________________________________|
|DescriptionDown       |z           |When browsing the package list, scrolls the information area down one line.    |
|______________________|____________|_______________________________________________________________________________|
|DescriptionUp         |a           |When browsing the package list, scrolls the information area up one line.      |
|______________________|____________|_______________________________________________________________________________|
|DoInstallRun          |g           |If not in a preview screen, display the preview screen [a]; if in a preview    |
|                      |            |screen, perform an install run.                                                |
|______________________|____________|_______________________________________________________________________________|
|Down                  |down,j      |Moves down: for instance, scrolls a text display down or selects the next item |
|                      |            |in a list.                                                                     |
|______________________|____________|_______________________________________________________________________________|
|DumpResolver          |*           |If packages are broken, writes the current state of the problem-resolver to a  |
|                      |            |file (for debugging purposes).                                                 |
|______________________|____________|_______________________________________________________________________________|
|End                   |end,C-e     |Move to the end of the current display: to the bottom of a list, or to the     |
|                      |            |right of a text entry field.                                                   |
|______________________|____________|_______________________________________________________________________________|
|ExamineSolution       |e           |If some packages are broken and aptitude has suggested a solution, display a   |
|                      |            |dialog box with a detailed description of the proposed solution.               |
|______________________|____________|_______________________________________________________________________________|
|ExpandAll             |[           |Expands the selected tree and all its children in a hierarchical list.         |
|______________________|____________|_______________________________________________________________________________|
|ExpandTree            |right       |Expands the selected tree in a hierarchical list.                              |
|______________________|____________|_______________________________________________________________________________|
|FirstSolution         |<           |Select the first solution produced by the problem resolver.                    |
|______________________|____________|_______________________________________________________________________________|
|ForbidUpgrade         |F           |Forbids a package from being upgraded to the currently available version (or a |
|                      |            |particular version).                                                           |
|______________________|____________|_______________________________________________________________________________|
|ForgetNewPackages     |f           |Discards all information about which packages are “new” (causes the list of|
|                      |            |“new” packages to become empty).                                           |
|______________________|____________|_______________________________________________________________________________|
|Help                  |?           |Displays the on-line help screen.                                              |
|______________________|____________|_______________________________________________________________________________|
|HistoryNext           |down,C-n    |In a line editor with history, moves forwards in the history.                  |
|______________________|____________|_______________________________________________________________________________|
|HistoryPrev           |up,C-p      |In a line editor with history, moves backwards in the history.                 |
|______________________|____________|_______________________________________________________________________________|
|Hold                  |=           |Places a package on hold.                                                      |
|______________________|____________|_______________________________________________________________________________|
|Install               |+           |Flags a package for installation.                                              |
|______________________|____________|_______________________________________________________________________________|
|InstallSingle         |I           |Marks a single package for installation; all other packages are kept at their  |
|                      |            |current version.                                                               |
|______________________|____________|_______________________________________________________________________________|
|Keep                  |:           |Cancels all installation or removal requests and all holds for a package.      |
|______________________|____________|_______________________________________________________________________________|
|LastSolution          |<           |Select the last solution produced by the problem resolver.                     |
|______________________|____________|_______________________________________________________________________________|
|Left                  |left,h      |Moves left: for instance, moves one menu to the left in the menu bar, or moves |
|                      |            |the cursor to the left when editing text.                                      |
|______________________|____________|_______________________________________________________________________________|
|LevelDown             |J           |In a hierarchical list, selects the next sibling of the currently selected item|
|                      |            |(the next item at the same level with the same parent).                        |
|______________________|____________|_______________________________________________________________________________|
|LevelUp               |K           |In a hierarchical list, selects the previous sibling of the currently selected |
|                      |            |item (the previous item at the same level with the same parent).               |
|______________________|____________|_______________________________________________________________________________|
|MarkUpgradable        |U           |Attempts to upgrade all packages which are not held back or forbidden from     |
|                      |            |upgrading. It also installs new Essential or Required packages.                |
|______________________|____________|_______________________________________________________________________________|
|MineFlagSquare        |f           |In Minesweeper, places or removes a flag on a square.                          |
|______________________|____________|_______________________________________________________________________________|
|MineLoadGame          |L           |Loads a Minesweeper game.                                                      |
|______________________|____________|_______________________________________________________________________________|
|MineSaveGame          |S           |Saves a Minesweeper game.                                                      |
|______________________|____________|_______________________________________________________________________________|
|MineSweepSquare       |No binding  |Sweeps around the current square in Minesweeper.                               |
|______________________|____________|_______________________________________________________________________________|
|MineUncoverSquare     |No binding  |Uncovers the current square in Minesweeper                                     |
|______________________|____________|_______________________________________________________________________________|
|MineUncoverSweepSquare|enter       |Uncovers the current square in Minesweeper if it is covered; otherwise, sweeps |
|                      |            |around it.                                                                     |
|______________________|____________|_______________________________________________________________________________|
|NextPage              |pagedown,C-f|Moves the current display one page forward.                                    |
|______________________|____________|_______________________________________________________________________________|
|NextSolution          |.           |Advance the dependency resolver to the next solution.                          |
|______________________|____________|_______________________________________________________________________________|
|No                    |n[b]        |This key will select the “no” button in yes/no dialog boxes.               |
|______________________|____________|_______________________________________________________________________________|
|                      |^, left (in |Selects the parent of the selected item in a hierarchical list. left is used   |
|Parent                |package     |only in package items (rows) when showing trees of packages.                   |
|                      |items)      |                                                                               |
|______________________|____________|_______________________________________________________________________________|
|PrevPage              |pageup,C-b  |Moves the current display one page backward.                                   |
|______________________|____________|_______________________________________________________________________________|
|PrevSolution          |,           |Return the dependency resolver to the previous solution.                       |
|______________________|____________|_______________________________________________________________________________|
|Purge                 |_           |Flags the currently selected package to be purged.                             |
|______________________|____________|_______________________________________________________________________________|
|PushButton            |space,enter |Activates the currently selected button, or toggles a checkbox.                |
|______________________|____________|_______________________________________________________________________________|
|Quit                  |q           |Close the current view.                                                        |
|______________________|____________|_______________________________________________________________________________|
|QuitProgram           |Q           |Quit the entire program.                                                       |
|______________________|____________|_______________________________________________________________________________|
|RejectBreakHolds      |           |Reject all resolver actions that would break a hold; equivalent to Resolver →|
|                      |            |Reject Breaking Holds.                                                         |
|______________________|____________|_______________________________________________________________________________|
|Refresh               |C-l         |Redraws the screen from scratch.                                               |
|______________________|____________|_______________________________________________________________________________|
|Remove                |-           |Flags a package for removal.                                                   |
|______________________|____________|_______________________________________________________________________________|
|ReInstall             |L           |Flags the currently selected package to be reinstalled.                        |
|______________________|____________|_______________________________________________________________________________|
|RepeatSearchBack      |N           |Repeats the last search, but searches in the opposite direction.               |
|______________________|____________|_______________________________________________________________________________|
|ReSearch              |n           |Repeats the last search.                                                       |
|______________________|____________|_______________________________________________________________________________|
|ReverseDependencies   |r           |Displays packages which depend upon the currently selected package.            |
|______________________|____________|_______________________________________________________________________________|
|Right                 |right,l     |Moves right: for instance, moves one menu to the right in the menu bar, or     |
|                      |            |moves the cursor to the right when editing text.                               |
|______________________|____________|_______________________________________________________________________________|
|Search                |/           |Activate the “search” function of the currently active interface element.  |
|______________________|____________|_______________________________________________________________________________|
|SearchBack            |\           |Activate the “search backwards” function of the currently active interface |
|                      |            |element.                                                                       |
|______________________|____________|_______________________________________________________________________________|
|SearchBroken          |b           |In a package tree, search for the next broken package.                         |
|______________________|____________|_______________________________________________________________________________|
|SetAuto               |M           |Marks the current package as having been automatically installed.              |
|______________________|____________|_______________________________________________________________________________|
|ShowHideDescription   |D           |In a package list, toggles whether the information area is visible.            |
|______________________|____________|_______________________________________________________________________________|
|SolutionActionApprove |a           |When viewing a solution, marks the currently selected action as "approved" (it |
|                      |            |will be included in future solutions whenever possible).                       |
|______________________|____________|_______________________________________________________________________________|
|SolutionActionReject  |r           |When viewing a solution, marks the currently selected action as "rejected"     |
|                      |            |(future solutions will not contain it).                                        |
|______________________|____________|_______________________________________________________________________________|
|ToggleExpanded        |enter       |Expands or collapses the currently selected tree in a hierarchical list.       |
|______________________|____________|_______________________________________________________________________________|
|ToggleMenuActive      |C-m,f10,C-  |Activates or deactivates the main menu.                                        |
|                      |space       |                                                                               |
|______________________|____________|_______________________________________________________________________________|
|Undo                  |C-_,C-u     |Cancels the last action, up to when aptitude was started OR the last time you  |
|                      |            |update the package lists or installed packages.                                |
|______________________|____________|_______________________________________________________________________________|
|Up                    |up,k        |Moves up: for instance, scrolls a text display up or selects the previous item |
|                      |            |in a list.                                                                     |
|______________________|____________|_______________________________________________________________________________|
|UpdatePackageList     |u           |Updates the list of packages by fetching new lists from the Internet if        |
|                      |            |necessary.                                                                     |
|______________________|____________|_______________________________________________________________________________|
|Versions              |v           |Displays the available versions of the currently selected package.             |
|______________________|____________|_______________________________________________________________________________|
|Yes                   |y [b]       |This key will select the “Yes” button in yes/no dialog boxes.              |
|______________________|____________|_______________________________________________________________________________|
|[a] unless Aptitude::Display-Planned-Action is false.                                                              |
|                                                                                                                   |
|[b] This default may be different in different locales.                                                            |
|___________________________________________________________________________________________________________________|

In addition to letter keys, number keys, and punctuation, the following
“special” keys can be bound:

 _____________________________________________________________________________
|Key name        |Description                                                 |
|________________|____________________________________________________________|
|a1              |The A1 key.                                                 |
|________________|____________________________________________________________|
|a3              |The A3 key.                                                 |
|________________|____________________________________________________________|
|b2              |The B2 key.                                                 |
|________________|____________________________________________________________|
|backspace       |The Backspace key.                                          |
|________________|____________________________________________________________|
|backtab         |The back-tab key                                            |
|________________|____________________________________________________________|
|begin           |The Begin key (not Home)                                    |
|________________|____________________________________________________________|
|break           |The “break” key.                                        |
|________________|____________________________________________________________|
|c1              |The C1 key.                                                 |
|________________|____________________________________________________________|
|c3              |The C3 key.                                                 |
|________________|____________________________________________________________|
|cancel          |The Cancel key.                                             |
|________________|____________________________________________________________|
|create          |The Create key.                                             |
|________________|____________________________________________________________|
|comma           |Comma (,) -- note that because commas are used to list keys,|
|                |this is the only way to bind to a comma.                    |
|________________|____________________________________________________________|
|command         |The Command key.                                            |
|________________|____________________________________________________________|
|copy            |The Copy key.                                               |
|________________|____________________________________________________________|
|delete          |The Delete key.                                             |
|________________|____________________________________________________________|
|delete_line     |The “delete line” key.                                  |
|________________|____________________________________________________________|
|down            |The “down” arrow key.                                   |
|________________|____________________________________________________________|
|end             |The End key.                                                |
|________________|____________________________________________________________|
|entry           |The Enter key.                                              |
|________________|____________________________________________________________|
|exit            |The Exit key.                                               |
|________________|____________________________________________________________|
|f1, f2, ..., f10|The F1 through F10 keys.                                    |
|________________|____________________________________________________________|
|find            |The Find key.                                               |
|________________|____________________________________________________________|
|home            |The Home key.                                               |
|________________|____________________________________________________________|
|insert          |The Insert key.                                             |
|________________|____________________________________________________________|
|insert_exit     |The “insert exit” key.                                  |
|________________|____________________________________________________________|
|clear           |The “clear” key.                                        |
|________________|____________________________________________________________|
|clear_eol       |The “clear to end of line” key.                         |
|________________|____________________________________________________________|
|clear_eos       |The “clear to end of screen” key.                       |
|________________|____________________________________________________________|
|insert_line     |The “insert line” key.                                  |
|________________|____________________________________________________________|
|left            |The “left” arrow key.                                   |
|________________|____________________________________________________________|
|mark            |The Mark key.                                               |
|________________|____________________________________________________________|
|message         |The Message key.                                            |
|________________|____________________________________________________________|
|move            |The Move key.                                               |
|________________|____________________________________________________________|
|next            |The Next key.                                               |
|________________|____________________________________________________________|
|open            |The Open key.                                               |
|________________|____________________________________________________________|
|previous        |The Previous key.                                           |
|________________|____________________________________________________________|
|print           |The Print key.                                              |
|________________|____________________________________________________________|
|redo            |The Redo key.                                               |
|________________|____________________________________________________________|
|reference       |The Reference key.                                          |
|________________|____________________________________________________________|
|refresh         |The Refresh key.                                            |
|________________|____________________________________________________________|
|replace         |The Replace key.                                            |
|________________|____________________________________________________________|
|restart         |The Restart key.                                            |
|________________|____________________________________________________________|
|resume          |The Resume key.                                             |
|________________|____________________________________________________________|
|return          |The Return key.                                             |
|________________|____________________________________________________________|
|right           |The “right” arrow key.                                  |
|________________|____________________________________________________________|
|save            |The Save key.                                               |
|________________|____________________________________________________________|
|scrollf         |The “scroll forward” key.                               |
|________________|____________________________________________________________|
|scrollr         |The “scroll backwards” key.                             |
|________________|____________________________________________________________|
|select          |The Select key.                                             |
|________________|____________________________________________________________|
|suspend         |The Suspend key.                                            |
|________________|____________________________________________________________|
|pagedown        |The “Page Down” key.                                    |
|________________|____________________________________________________________|
|pageup          |The “Page Up” key.                                      |
|________________|____________________________________________________________|
|space           |The Space key                                               |
|________________|____________________________________________________________|
|tab             |The Tab key                                                 |
|________________|____________________________________________________________|
|undo            |The Undo key.                                               |
|________________|____________________________________________________________|
|up              |The “up” arrow key.                                     |
|________________|____________________________________________________________|

In addition to binding keys globally, it is possible to change key bindings for
one particular part (or domain) of aptitude: for instance, to make Tab the
equivalent of the right arrow key in menu bars, set Aptitude::UI::Keybindings::
Menubar::Right to “tab,right”. The following domains are available:

 _____________________________________________________________________________________________
|Domain       |Description                                                                    |
|_____________|_______________________________________________________________________________|
|EditLine     |Used by line-editing widgets, such as the entry field in a “search” dialog.|
|_____________|_______________________________________________________________________________|
|Menu         |Used by drop-down menus.                                                       |
|_____________|_______________________________________________________________________________|
|Menubar      |Used by the menu bar at the top of the screen.                                 |
|_____________|_______________________________________________________________________________|
|Minesweeper  |Used by the Minesweeper mode.                                                  |
|_____________|_______________________________________________________________________________|
|MinibufChoice|Used by the multiple-choice prompts that appear if you have chosen to have some|
|             |prompts appear in the status line.                                             |
|_____________|_______________________________________________________________________________|
|Pager        |Used when displaying a file on disk (for instance, the help text).             |
|_____________|_______________________________________________________________________________|
|PkgNode      |Used by packages, trees of packages, package versions, and package dependencies|
|             |when they appear in package lists.                                             |
|_____________|_______________________________________________________________________________|
|PkgTree      |Used by package lists.                                                         |
|_____________|_______________________________________________________________________________|
|Table        |Used by tables of widgets (for instance, dialog boxes).                        |
|_____________|_______________________________________________________________________________|
|TextLayout   |Used by formatted text displays, such as package descriptions.                 |
|_____________|_______________________________________________________________________________|
|Tree         |Used by all tree displays (including package lists, for which it can be        |
|             |overridden by PkgTree).                                                        |
|_____________|_______________________________________________________________________________|


Customizing text colors and styles

The colors and visual styles used by aptitude to display text can be extensively
customized. Each visual element has an associated “style”, which describes the
particular colors and visual attributes that will be used to display that
element. Styles take the form of a list of color and attribute settings. This
list is not necessarily exhaustive; if some colors or attributes are not
explicitly specified, their values will be taken from the surrounding visual
context. In fact, most visual elements have an “empty” style by default.

You can change the contents of a style by creating a configuration group of the
same name in the apt or aptitude configuration file. For instance, the
“MenuBorder” style is used to draw the visual border around drop-down menus. By
default, this border is drawn bold and white-on-blue. Placing the following text
in the configuration file would change it to white-on-cyan:

Aptitude::UI::Styles {
  MenuBorder {fg white; bg cyan; set bold;};
};

As you can see, a style's configuration group consists of a sequence of
instructions. The general classes of instructions are:



  fg color
      Sets the text foreground to the given color. See below for a list of the
      colors known to aptitude.


  bg color
      Sets the text background to the given color. See below for a list of the
      colors known to aptitude.


  set attribute
      Enables the given text attribute. See below for a list of the text
      attributes known to aptitude.


  clear attribute
      Disables the given text attribute. See below for a list of the text
      attributes known to aptitude.


  flip attribute
      Toggles the given text attribute: if it is enabled in the surrounding
      element, it will be disabled, and vice versa. See below for a list of the
      text attributes known to aptitude.


The colors that aptitude recognizes are black, blue, cyan, green, magenta, red,
white, and yellow [20]. In addition, you may specify default in place of a
background color to use the default terminal background (this could be the
default color, an image file, or even “transparent”). The styles that aptitude
recognizes are:



  blink
      Enables blinking text.


  bold
      Makes the foreground color of the text (or the background if reverse video
      is enabled) brighter.


  dim
      May cause text to be extra-dim on some terminals. No effect has been
      observed on common Linux terminals.


  reverse
      Swaps the foreground and background colors. Many visual elements flip this
      attribute to perform common highlighting tasks.


  standout
      This enables “the best highlighting mode of the terminal”. In xterms it is
      similar, but not idential to, reverse video; behavior on other terminals
      may vary.


  underline
      Enables underlined text.


You can select several attributes at once by separating them with commas; for
instance, set bold,standout;.


IMG.alt.suffix = \[Note]] Note

                          As hinted at above, the interpretation of both styles
                          and text attributes is highly terminal-dependent. You
                          may need to experiment a bit to find out exactly what
                          some settings do on your terminal.


The following styles can be customized in aptitude:

Figure 2.14. Customizable styles in aptitude

 ________________________________________________________________________________________________________________________
|Style                     |Default      |Description                                                                    |
|__________________________|_____________|_______________________________________________________________________________|
|Bullet                    |fg yellow;   |The style of the bullets in bulleted lists.                                    |
|                          |set bold;    |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |             |The style of newer versions of the package in the changelog view. Note that    |
|ChangelogNewerVersion     |set bold;    |aptitude will only highlight newer versions of the package if you have the     |
|                          |             |package libparse-debianchangelog-perl installed.                               |
|__________________________|_____________|_______________________________________________________________________________|
|Default                   |fg white; bg |The basic style of the screen.                                                 |
|                          |black;       |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|DepBroken                 |fg black; bg |The style of unfulfilled dependencies.                                         |
|                          |red;         |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg black; bg |                                                                               |
|DisabledMenuEntry         |blue; set    |The style of menu entries that are disabled and cannot be used.                |
|                          |dim;         |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|DownloadHit               |fg black; bg |The style used to indicate that a file was “hit”: i.e., it has not changed |
|                          |green;       |since the last time it was downloaded.                                         |
|__________________________|_____________|_______________________________________________________________________________|
|DownloadProgress          |fg blue; bg  |The style of the progress indicator for a download.                            |
|                          |yellow;      |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|EditLine                  |black; clear |The style of line editors (for instance, the entry in the “Search” dialog).|
|                          |reverse;     |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|Error                     |red; set     |The style of error messages.                                                   |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|Header                    |blue; set    |The style of screen headers.                                                   |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|HighlightedMenuBar        |blue; set    |The style of the currently selected menu name in the menu bar.                 |
|                          |bold,reverse;|                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|HighlightedMenuEntry      |blue; set    |The style of the currently selected choice in a menu.                          |
|                          |bold,reverse;|                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg yellow; bg|                                                                               |
|MediaChange               |red; set     |The style of the dialog used to ask the user to insert a new CD.               |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|MenuBar                   |blue; set    |The style of the menu bar.                                                     |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|MenuBorder                |blue; set    |The style of the borders that surround a drop-down menu.                       |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|MenuEntry                 |fg white; bg |The style of each entry in a drop-down menu.                                   |
|                          |blue;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|MineBomb                  |fg red; set  |The style of bombs in Minesweeper.                                             |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|MineBorder                |set bold;    |The style of the border drawn around a Minesweeper board.                      |
|__________________________|_____________|_______________________________________________________________________________|
|MineFlag                  |fg red; set  |The style of flags in Minesweeper.                                             |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|MineNumberN               |Various      |The style of the number N in Minesweeper; N may range from 0 to 8.             |
|__________________________|_____________|_______________________________________________________________________________|
|MultiplexTab              |fg white; bg |The color used to display “tabs” other than the currently selected one.    |
|                          |blue;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|MultiplexTabHighlighted   |fg blue; bg  |The color used to display the currently selected “tab”.                    |
|                          |white;       |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgBroken                 |fg red; flip |The style of packages in the package list which have unfulfilled dependencies. |
|                          |reverse;     |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgBrokenHighlighted      |fg red;      |The style of highlighted packages in the package list which have unfulfilled   |
|                          |             |dependencies.                                                                  |
|__________________________|_____________|_______________________________________________________________________________|
|PkgNotInstalled           |            |The style of packages which are not currently installed and will not be        |
|                          |             |installed.                                                                     |
|__________________________|_____________|_______________________________________________________________________________|
|PkgNotInstalledHighlighted|            |The style of highlighted packages which are not currently installed and will   |
|                          |             |not be installed.                                                              |
|__________________________|_____________|_______________________________________________________________________________|
|PkgIsInstalled            |set bold;    |The style of packages which are currently installed and for which no actions   |
|                          |             |are scheduled.                                                                 |
|__________________________|_____________|_______________________________________________________________________________|
|PkgIsInstalledHighlighted |set bold;    |The style of highlighted packages which are currently installed and for which  |
|                          |flip reverse;|no actions are scheduled.                                                      |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToDowngrade            |set bold;    |The style of packages in the package list which will be downgraded.            |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToDowngradeHighlighted |set bold;    |The style of highlighted packages in the package list which will be downgraded.|
|                          |flip reverse |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToHold                 |fg white;    |The style of packages in the package list which are on hold.                   |
|                          |flip reverse;|                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToHoldHighlighted      |fg white;    |The style of highlighted packages in the package list which are on hold.       |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToInstall              |fg green;    |The style of packages in the package list which are being installed (not       |
|                          |flip reverse;|upgraded) or reinstalled.                                                      |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToInstallHighlighted   |fg green;    |The style of highlighted packages in the package list which are being installed|
|                          |             |(not upgraded) or reinstalled.                                                 |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToRemove               |fg magenta;  |The style of packages in the package list which will be removed or purged.     |
|                          |flip reverse;|                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToRemoveHighlighted    |fg magenta;  |The style of highlighted packages in the package list which will be removed or |
|                          |             |purged.                                                                        |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToUpgrade              |fg cyan; flip|The style of packages in the package list which will be upgraded.              |
|                          |reverse;     |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|PkgToUpgradeHighlighted   |fg cyan;     |The style of highlighted packages in the package list which will be upgraded.  |
|__________________________|_____________|_______________________________________________________________________________|
|Progress                  |fg blue; bg  |The style of progress indicators such as the one that appears while the package|
|                          |yellow;      |cache is being loaded.                                                         |
|__________________________|_____________|_______________________________________________________________________________|
|SolutionActionApproved    |bg green;    |The style of approved actions in a solution.                                   |
|__________________________|_____________|_______________________________________________________________________________|
|SolutionActionRejected    |bg red;      |The style of rejected actions in a solution.                                   |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg white; bg |                                                                               |
|Status                    |blue; set    |The style of status lines at the bottom of the screen.                         |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|
|TreeBackground            |            |The basic color of all visual lists and trees.                                 |
|__________________________|_____________|_______________________________________________________________________________|
|                          |fg red; bg   |                                                                               |
|TrustWarning              |black; set   |The color used to display warnings about package trust.                        |
|                          |bold;        |                                                                               |
|__________________________|_____________|_______________________________________________________________________________|




Customizing the display layout

It is possible to rearrange the aptitude package list by making suitable
modifications to the configuration file.


Display elements

The layout is stored in the configuration group Aptitude::UI::Default-Package-
View, and consists of a list of display elements:

Name Type {
  Row row;
  Column column;
  Width width;
  Height height;

  additional options...
};

This creates a display element named Name; the type of element created is
determined by Type. The Row, Column, Width, and Height options must be present;
they determine where the display element is placed. (see below for a detailed
explanation of how display elements are arranged)

For examples of how to change the display layout, see the theme definitions in
the file /usr/share/aptitude/aptitude-defaults.

The following types of display elements are available:



  Description
      This display element will contain the “information area” (typically a
      description of the currently selected package).

      The option PopUpDownKey gives the name of a keyboard command which will
      cause the display element to be shown or hidden. For instance, setting
      this to ShowHideDescription will give the current display element the same
      behavior as the default information area. The option PopUpDownLinked gives
      the name of another display element; the current element will be shown or
      hidden whenever the other element is.


  MainWidget
      This is a placeholder for the “main” display element: typically this is
      the list of packages. A display layout must contain exactly one MainWidget
      element: no more, no less.


  Static
      A region of the screen which displays some text, possibly containing
      formatting codes as described in the section called “Customizing how
      packages are displayed”. The text to display can be given in the Columns
      option, or it can be stored in another configuration variable specified by
      the ColumnsCfg option. The color of the text is determined by the color
      named by the Color option.

      Static items can be displayed and hidden in the same way as Description
      items, using the PopUpDownKey and PopUpDownLinked options.



Placement of display elements

The display elements are arranged in a “table”. The upper-left corner of an
element is in the cell given by its Row and Column options (typically starting
from row 0 and column 0, but this is not required). The width of an element in
cells is given by its Width option, and its height is given by its Height
option.

Once the display elements are arranged and have been given an initial amount of
space on the screen, there is likely to be space left over. If there is extra
vertical space, each row containing a display element whose RowExpand option is
true will be allocated a share of the extra space; similarly, if there is extra
horizontal space, each column containing a display element whose ColExpand
option is true will be allocated a share of the extra space.

In the event that there is not enough space, every row and column whose widgets
all have their RowShrink or ColShrink options set to true will be shrunk. If
this is not enough, all rows and columns are shrunk to fit into the available
space.

If a display element is not expanded, but its row or column is, its alignment is
determined by the RowAlign and ColAlign options. Setting them to Left, Right,
Top, Bottom, or Center will tell aptitude where to place the element within the
row or column.

For instance, the following configuration group creates a static element named
“Header”, which is three cells wide and will expand horizontally but not
vertically. It has the same color as other header lines and uses the standard
display format for header lines:

Header Static {
  Row 0;
  Column 0;
  Width 3;
  Height 1;

  ColExpand true;
  ColAlign Center;

  RowAlign Center;

  Color ScreenHeaderColor;
  ColumnsCfg HEADER;
};


Display layout option reference

The following options are available for display elements:



  ColAlign alignment;
      alignment must be either Left, Right, or Center. If the row containing the
      current display element is wider than the element itself and ColExpand is
      false, the element will be placed within the row according to the value of
      alignment.

      If this option is not present, it defaults to Left.


  ColExpand true|false;
      If this option is set to true, the column containing this display element
      will be allocated a share of any extra horizontal space that is available.

      If this option is not present, it defaults to false.


  Color colorname;
      This option applies to Static elements. colorname is the name of a color
      (for instance, ScreenStatusColor) which should be used as the “default”
      color for this display element.

      If this option is not present, it defaults to DefaultWidgetBackground.


  ColShrink true|false;
      If this option is set to true on each element in a column and there is not
      enough horizontal space, the column will be shrunk as necessary to fit the
      available space. Note that a column may be shrunk even if ColShrink is
      false; it simply indicates that aptitude should try shrinking a particular
      column before shrinking other columns.

      If this option is not present, it defaults to false.


  Column column;
      Specifies the leftmost column containing this display element.


  Columns format;
      This option applies to Static display elements for which the ColumnsCfg
      option is not set. It sets the displayed contents of the status item; it
      is a format string as described in the section called “Customizing how
      packages are displayed”.


  ColumnsCfg HEADER|STATUS|name;
      This option applies to Static display elements. It sets the display format
      of the current element to the value of another configuration variable: if
      it is HEADER or STATUS, the options Aptitude::UI::Package-Header-Format
      and Aptitude::UI::Package-Status-Format, repectively, are used; otherwise,
      the option name is used.

      If this option is not present, the value of the Columns option is used to
      control the contents of the static item.


  Height height;
      Specifies the height of the current display element.


  PopUpDownKey command;
      This option applies to Description and Static display elements.

      command is the name of a keyboard command (for instance,
      ShowHideDescription). When this key is pressed, the display element will
      be hidden if it is visible, and displayed if it is hidden.


  PopUpDownLinked element;
      This option applies to Description and Static display elements.

      element is the name of a display element. When element is displayed, the
      current element will also be displayed; when element is hidden, the
      current element will also be hidden.


  Row row;
      Specifies the uppermost row containing this display element.


  RowAlign alignment;
      alignment must be either Top, Bottom, or Center. If the row containing the
      current display element is taller than the element itself and RowExpand is
      false, the element will be placed within the row according to the value of
      alignment.

      If this option is not present, it defaults to Top.


  RowExpand true|false;
      If this option is set to true, the row containing this display element
      will be allocated a share of any extra vertical space that is available.

      If this option is not present, it defaults to false.


  RowShrink true|false;
      If this option is set to true on each element in a row and there is not
      enough vertical space, the row will be shrunk as necessary to fit the
      available space. Note that a row may be shrunk even if RowShrink is false;
      it simply indicates that aptitude should try shrinking a particular row
      before shrinking other rows.

      If this option is not present, it defaults to false.


  Visible true|false;
      If set to false, this display element will initially be hidden. Presumably
      only useful in conjunction with PopUpDownKey and/or PopUpDownLinked.

      If this option is not present, it defaults to true.


  Width width;
      Specifies the width of the current display element.



Configuration file reference


Configuration file format

In its basic form, aptitude's configuration file is a list of options and their
values. Each line of the file should have the form “Option Value;”: for
instance, the following line in the configuration file sets the option
Aptitude::Theme to “Dselect”.

Aptitude::Theme "Dselect";

An option can “contain” other options if they are written in curly braces
between the option and the semicolon following it, like this:

Aptitude::UI {
  Package-Status-Format "";
  Package-Display-Format "";
};

An option that contains other options is sometimes called a group. In fact, the
double colons that appear in option names are actually a shorthand way of
indicating containment: the option Aptitude::UI::Default-Grouping is contained
in the group Aptitude::UI, which itself is contained in the group Aptitude.
Thus, if you wanted to, you could set this option to "" as follows:

Aptitude {
  UI {
    Default-Grouping "";
  };
};

For more information on the format of the configuration file, see the manual
page apt.conf(5).


Locations of configuration files

aptitude's configuration is read from the following sources, in order:


  1. Configuration file options specified on the command-line.

  2. The user's configuration file, ~/.aptitude/config. This file is overwritten
     when the user modifies settings in the Options menu.

  3. The system configuration file, /etc/apt/apt.conf.

  4. The system configuration fragment files, /etc/apt/apt.conf.d/*.

  5. The file specified by the APT_CONFIG environment variable (if any).

  6. Default values stored in /usr/share/aptitude/aptitude-defaults.

  7. Default values built into aptitude.


When an option is being checked, these sources are searched in order, and the
first one that provides a value for the option is used. For instance, setting an
option in /etc/apt/apt.conf will override aptitude's defaults for that option,
but will not override user settings in ~/.aptitude/config.


Available configuration options

The following configuration options are used by aptitude. Note that these are
not the only available configuration options; options used by the underlying apt
system are not listed here. See the manual pages apt(8) and apt.conf(5) for
information on apt options.

Option:APT::AutoRemove::RecommendsImportant

Default:true

Description: If this option is true, then aptitude will not consider packages to
be unused (and thus will not automatically remove them) as long as any installed
package recommends them, even if APT::Install-Recommends is false. For more
information, see the section called “Managing automatically installed packages”.

Option:APT::AutoRemove::SuggestsImportant

Default:true

Description: If this option is true, then aptitude will not consider packages to
be unused (and thus will not automatically remove them) as long as any installed
package suggests them. For more information, see the section called “Managing
automatically installed packages”.

Option:APT::Get::List-Cleanup

Default:true

Description: A synonym for APT::List-Cleanup. If either of these options is set
to false, aptitude will not delete old package list files after downloading a
new set of package lists.

Option:APT::List-Cleanup

Default:true

Description: A synonym for APT::Get::List-Cleanup. If either of these options is
set to false, aptitude will not delete old package list files after downloading
a new set of package lists.

Option:APT::Install-Recommends

Default:true

Description: If this option is true and Aptitude::Auto-Install is true, then
whenever you mark a package for installation, aptitude will also mark the
packages it recommends for installation. Furthermore, if this option is true,
aptitude will not consider packages to be unused (and thus will not
automatically remove them) as long as any installed package reommends them. For
more information, see the section called “Managing automatically installed
packages” and the section called “Immediate dependency resolution”.

Option:Aptitude::Allow-Null-Upgrade

Default:false

Description: Normally, if you try to start an install run when no actions will
be performed, aptitude will print a warning and return to the package list. If
this option is true, aptitude will continue to the preview screen whenever there
are upgradable packages, rather than displaying a reminder about the Actions →
Mark Upgradable (U) command.

Option:Aptitude::Always-Use-Safe-Resolver

Default:false

Description: If this option is true, aptitude's command-line actions will always
use a “safe” dependency resolver, as if --safe-resolver had been passed on the
command line.

Option:Aptitude::Autoclean-After-Update

Default:false

Description: If this option is true, aptitude will clean up obsolete files (see
Actions → Clean obsolete files) every time you update the package list. This
option is similar to Aptitude::Clean-After-Install.

Option:Aptitude::Auto-Fix-Broken

Default:true

Description: If this option is false, aptitude will ask for permission before
attempting to fix any broken packages.

Option:Aptitude::Auto-Install

Default:true

Description: If this option is true, aptitude will automatically attempt to
fulfill the dependencies of a package when you mark a package to be installed or
upgraded.

Option:Aptitude::Auto-Install-Remove-Ok

Default:false

Description: If this option is true, aptitude will automatically remove
conflicting packages when you mark a package to be installed or upgraded.
Normally these conflicts are flagged and you must handle them manually.

Option:Aptitude::Auto-Upgrade

Default:false

Description: If this option is true, aptitude will automatically flag all
upgradable packages for upgrade when the program starts, as if you had issued
the command Actions → Mark Upgradable (U).

Option:Aptitude::Clean-After-Install

Default:false

Description: If this option is true, aptitude will clean up all files in the
package cache directory (see Actions → Clean package cache) after successful
installation of packages (or similar operations). This option is similar to
Aptitude::Autoclean-After-Update.

Option:Aptitude::CmdLine::Always-Prompt

Default:false

Description: In command-line mode, if this is set, aptitude will always prompt
before starting to install or remove packages, even if the prompt would normally
be skipped. This is equivalent to the -P command-line option.

Option:Aptitude::CmdLine::Assume-Yes

Default:false

Description: In command-line mode, if this option is true, aptitude will act as
if the user had answered “yes” to every prompt, causing most prompts to be
skipped. This is equivalent to the -y command-line option.

Option:Aptitude::CmdLine::Disable-Columns

Default:false

Description: If this option is enabled, the results of command-line searches
(performed via aptitude search) will not be formatted into fixed-width columns
or truncated to the screen width. This is equivalent to the --disable-columns
command-line option.

Option:Aptitude::CmdLine::Download-Only

Default:false

Description: In command-line mode, if this option is true, aptitude will
download package files but not install them. This is equivalent to the -
d command-line option.

Option:Aptitude::CmdLine::Fix-Broken

Default:false

Description: In command-line mode, if this option is true, aptitude will be more
aggressive when attempting to fix the dependencies of broken packages. This is
equivalent to the -f command-line option.

Option:Aptitude::CmdLine::Versions-Group-By

Default: Set to auto, none, package, or source-package to control whether and
how the output of aptitude versions is grouped. Equivalent to the command-line
option --group-by (see its documentation for more description of what the values
mean).

Option:Aptitude::CmdLine::Ignore-Trust-Violations

Default:false

Description: In command-line mode, causes aptitude to ignore the installation of
untrusted packages. This is a synonym for APT::Get::AllowUnauthenticated.

Option:Aptitude::CmdLine::Package-Display-Format

Default:%c%a%M %p# - %d#

Description: This is a format string, as described in the section called
“Customizing how packages are displayed”, which is used to display the results
of a command-line search. This is equivalent to the -F command-line option.

Option:Aptitude::CmdLine::Package-Display-Width

Default:

Description: This option gives the width in characters for which command-line
search results should be formatted. If it is empty (the default; ie, ""), search
results will be formatted for the current terminal size, or for an 80-column
display if the terminal size cannot be determined.

Option:Aptitude::CmdLine::Progress::Percent-On-Right

Default:false

Description: This option controls whether command-line progress indicators
display the percentage on the left-hand side of the screen, in the same style as
apt-get, or on the right-hand side (the default). This option does not affect
download progress indicators.

Option:Aptitude::CmdLine::Progress::Retain-Completed

Default:false

Description: If this value is false, then command-line progress indicators will
be deleted and overwritten once the task they represent is completed. If it is
true, then they will be left on the terminal. This option does not affect
download progress indicators.

Option:Aptitude::CmdLine::Request-Strictness

Default:10000

Description: When run in command-line mode, if dependency problems are
encountered, aptitude will add this value to the problem resolver score of each
action that you explicitly request.

Option:Aptitude::CmdLine::Resolver-Debug

Default:false

Description: In command-line mode, if this option is true, aptitude will print
extremely verbose information while attempting to resolve broken dependencies.
As the name suggests, this option is primarily meant to aid in debugging the
problem resolver.

Option:Aptitude::CmdLine::Resolver-Dump

Default:

Description: In command-line mode, if it is necessary to resolve broken
dependencies and this option is set to the name of a writable file, the resolver
state will be dumped to this file before any calculations are undertaken.

Option:Aptitude::CmdLine::Resolver-Show-Steps

Default:false

Description: If this option is true, then a dependency solution will be
displayed as a sequence of resolutions of individual dependencies; for instance,
“wesnoth depends upon wesnoth-data (= 1.2.4-1) -> installing wesnoth-data 1.2.4-
1 (unstable)”. To toggle between the two display modes, press o at the prompt
“Accept this solution?”.

Option:Aptitude::CmdLine::Show-Deps

Default:false

Description: In command-line mode, if this option is true, aptitude will display
a brief summary of the dependencies (if any) relating to a package's state. This
is equivalent to the -D command-line option.

Option:Aptitude::CmdLine::Show-Size-Changes

Default:false

Description: In command-line mode, if this option is true, aptitude will display
the expected change in the amount of space used by each package. This is
equivalent to the -Z command-line option.

Option:Aptitude::CmdLine::Show-Summary

Default:no-summary

Description: This option sets the default value of the command-line argument --
show-summary. See the documentation of --show-summary for a list of the allowed
values of this option and their meanings.

Option:Aptitude::CmdLine::Show-Versions

Default:false

Description: In command-line mode, if this option is true, aptitude will display
the version of a package that is being installed or removed. This is equivalent
to the -V command-line option.

Option:Aptitude::CmdLine::Show-Why

Default:false

Description: In command-line mode, if this option is true, aptitude will display
the manually installed packages that require each automatically installed
package, or the manually installed packages that cause a conflict with each
automatically removed package. This is equivalent to the -W command-line option
and displays the same information you can access via aptitude why or by pressing
i in a package list.

Option:Aptitude::CmdLine::Version-Display-Format

Default:%c%a%M %p# %t %i

Description: This is a format string, as described in the section called
“Customizing how packages are displayed”, which is used to display the output of
aptitude versions. This is equivalent to the -F command-line option.

Option:Aptitude::CmdLine::Versions-Show-Package-Names

Default: Set to always, auto, or never to control when package names are
displayed in the output of aptitude versions. Equivalent to the command-line
option --show-package-names (see its documentation for more description of what
the values mean).

Option:Aptitude::Safe-Resolver::Show-Resolver-Actions

Default:false

Description: If this option is enabled, then when the “safe” dependency resolver
has been activated via --safe-resolver or because the command-line action is
safe-upgrade, it will display a summary of the actions taken by the resolver
before showing the installation preview. Equivalent to the command-line option -
-show-resolver-actions.

Option:Aptitude::Screenshot::IncrementalLoadLimit

Default:16384

Description: The minimum size in bytes at which aptitude will begin to display
screenshots incrementally. Below this size, screenshots will not appear until
they are fully downloaded.

Option:Aptitude::Screenshot::Cache-Max

Default:4194304

Description: The maximum number of bytes of screenshot data that aptitude will
store in memory for screenshots that are not currently being displayed. The
default is four megabytes.

Option:Aptitude::CmdLine::Simulate

Default:false

Description: This option is deprecated; use Aptitude::Simulate instead. In
command-line mode, causes aptitude to just display the actions that would be
performed (rather than actually performing them); in the visual interface,
causes aptitude to start in read-only mode regardless of whether you are root or
not. This is equivalent to the -s command-line option.

Option:Aptitude::CmdLine::Verbose

Default:0

Description: This controls how verbose the command-line mode of aptitude is.
Every occurrence of the -v command-line option adds 1 to this value.

Option:Aptitude::CmdLine::Visual-Preview

Default:false

Description: If this option is true, aptitude will enter its visual interface to
display the preview of an installation run and to download packages.

Option:Aptitude::Delete-Unused

Default:true

Description: If this option is true, automatically installed packages which are
no longer required will be automatically removed. For more information, see the
section called “Managing automatically installed packages”.

Option:Aptitude::Delete-Unused-Pattern

Default:

Description: Deprecated alias for Aptitude::Keep-Unused-Pattern. If Aptitude::
Keep-Unused-Pattern is unset or set to an empty string, the value of this
configuration option will override it. Otherwise, Aptitude::Delete-Unused-
Pattern is ignored.

Option:Aptitude::Display-Planned-Action

Default:true

Description: If this option is true, aptitude will display a preview screen
before actually carrying out the actions you have requested.

Option:Aptitude::Forget-New-On-Install

Default:false

Description: If this option is true, aptitude will clear the list of new
packages whenever you install, upgrade, or remove packages, as if you had issued
the command Actions → Forget new packages (f).

Option:Aptitude::Forget-New-On-Update

Default:false

Description: If this option is true, aptitude will clear the list of new
packages whenever the package list is updated, as if you had issued the command
Actions → Forget new packages (f).

Option:Aptitude::Get-Root-Command

Default:su:/bin/su

Description: This option sets the external command that aptitude will use to
switch to the root user (see the section called “Becoming root”). It has the
form protocol:command. protocol must be either su or sudo; it determines how
aptitude invokes the program when it wants to gain root privileges. If protocol
is su, then “command -c arguments” is used to become root; otherwise, aptitude
uses “command arguments”. The first word in command is the name of the program
that should be invoked; remaining words are treated as arguments to that
program.

Option:Aptitude::Ignore-Old-Tmp

Default:false

Description: Old versions of aptitude created a directory ~/.aptitude/.tmp which
is no longer necessary. If the directory exists and Aptitude::Ignore-Old-Tmp is
true, aptitude will ask you whether to remove this directory. This option is
automatically set to true after you reply. On the other hand, if the directory
does not exist, this option is set to false so that you will be notified if it
reappears.

Option:Aptitude::Ignore-Recommends-Important

Default:false

Description: In previous versions of aptitude, the setting Aptitude::Recommends-
Important caused recommendations to be installed automatically, the same way
that APT::Install-Recommends does today. If this option is set to false and
Aptitude::Recommends-Important is also set to false, aptitude will set APT::
Install-Recommends to false and set Aptitude::Ignore-Recommends-Important to
true on startup.

Option:Aptitude::Keep-Recommends

Default:false

Description: This is an obsolete option; use APT::AutoRemove::
RecommendsImportant instead. Setting this option to true has the same effect as
setting APT::AutoRemove::RecommendsImportant to true.

Option:Aptitude::Keep-Suggests

Default:false

Description: This is an obsolete option; use APT::AutoRemove::SuggestsImportant
instead. Setting this option to true has the same effect as setting APT::
AutoRemove::SuggestsImportant to true.

Option:Aptitude::Keep-Unused-Pattern

Default:

Description: If Aptitude::Delete-Unused is true, only unused packages which do
not match this pattern (see the section called “Search patterns”) will be
removed. If this option is set to an empty string (the default), all unused
packages will be removed.

Option:Aptitude::LockFile

Default:/var/lock/aptitude

Description: A file that will be fcntl-locked to ensure that at most one
aptitude process can modify the cache at once. In normal circumstances, you
should never need to modify this; it may be useful for debugging. Note: if
aptitude complains that it cannot acquire a lock, this is not because the lock
file needs to be deleted. fcntl locks are managed by the kernel and will be
destroyed when the program holding them terminates; failure to acquire the lock
means that another running program is using it!

Option:Aptitude::Localize-Log

Default:false

Description: If this option is enabled, aptitude will use the user's locale for
messages and dates in the log file; otherwise it is written in the "classic"
locale, to avoid having the log file written in different languages (depending
on the locales of the users running the program).

Option:Aptitude::Log

Default:/var/log/aptitude

Description: If this is set to a nonempty string, aptitude will log the package
installations, removals, and upgrades that it performs. If the value of
Aptitude::Log begins with a pipe character (ie, “|”), the remainder of its value
is used as the name of a command into which the log will be piped: for instance,
|mail -s 'Aptitude install run' root will cause the log to be emailed to root.
To log to multiple files or commands, you may set this option to a list of log
targets.

Option:Aptitude::Logging::File

Default:

Description: If this is set to a nonempty string, aptitude will write logging
messages to it; setting it to “-” causes logging messages to be printed to
standard output. This differs from the setting Aptitude::Log: that file is used
to log installations and removals, whereas this file is used to log program
events, errors, and debugging messages (if enabled). This option is equivalent
to the command-line argument --log-file. See also Aptitude::Logging::Levels.

Option:Aptitude::Logging::Levels

Default:(empty)

Description: This option is a group whose members control which log messages are
written. Each entry is either “level”, to set the global log level (the log
level of the root logger) to the given level, or “category:level”, where
category is the category of messages to modify (such as
aptitude.resolver.hints.match) and level is the lowest log level of messages in
that category that should be displayed. Valid log levels are “fatal”, “error”,
“warn”, “info”, “debug”, and “trace”. The command-line option --log-level can be
used to set or override any log level.

Option:Aptitude::Parse-Description-Bullets

Default:true

Description: If this option is enabled, aptitude will attempt to automatically
detect bulleted lists in package descriptions. This will generally improve how
descriptions are displayed, but it is not entirely backwards-compatible; some
descriptions might be formatted less attractively when this option is true than
when it is false.

Option:Aptitude::Pkg-Display-Limit

Default:

Description: The default filter applied to the package list; see the section
called “Search patterns” for details about its format.

Option:Aptitude::ProblemResolver::Allow-Break-Holds

Default:false

Description: If this option is set to true, the problem resolver will consider
breaking package holds or installing forbidden versions in order to resolve a
dependency. If it is set to false, these actions will be rejected by default,
although you can always enable them manually (see the section called “Resolving
Dependencies Interactively”).

Option:Aptitude::ProblemResolver::BreakHoldScore

Default:-300

Description: How much to reward or penalize solutions that change the state of a
held package or install a forbidden version. Note that unless Aptitude::
ProblemResolver::Allow-Break-Holds is set to true, the resolver will never break
a hold or install a forbidden version unless it has explicit permission from the
user.

Option:Aptitude::ProblemResolver::Break-Hold-Level

Default:50000

Description: The safety cost assigned to actions that break a hold set by the
user (by upgrading a held package or by installing a forbidden version of a
package). See the section called “Safety costs” for a description of safety
costs.

Option:Aptitude::ProblemResolver::BrokenScore

Default:-100

Description: How much to reward or penalize prospective solutions based on the
number of dependencies they break. For each dependency broken by a possible
solution, this many points are added to its score; typically this should be a
negative value.

Option:Aptitude::ProblemResolver::CancelRemovalScore

Default:-300

Description: How much weight the problem resolver should give to not remove or
purge a package requested to be removed or purged.

Option:Aptitude::ProblemResolver::DefaultResolutionScore

Default:400

Description: How much to reward or penalize prospective solutions based on how
many “default” resolutions for currently unsatisfied dependencies they install.
The default resolution is the resolution that “apt-get install” or the
“immediate dependency resolver” would pick. The score is only applied for
dependencies and recommendations whose targets are not currently installed.

Option:Aptitude::ProblemResolver::Discard-Null-Solution

Default:true

Description: If this option is true, aptitude will never suggest cancelling all
of your proposed actions in order to resolve a dependency problem.

Option:Aptitude::ProblemResolver::EssentialRemoveScore

Default:-100000

Description: How much to reward or penalize solutions that remove an Essential
package.

Option:Aptitude::ProblemResolver::Remove-Essential-Level

Default:60000

Description: The safety cost assigned to actions that remove an Essential
package. See the section called “Safety costs” for a description of safety
costs.

Option:Aptitude::ProblemResolver::ExtraScore

Default:0

Description: Any version of a package whose Priority is “extra” will have this
many points added to its score.

Option:Aptitude::ProblemResolver::FullReplacementScore

Default:500

Description: Removing a package and installing another package that fully
replaces it (i.e., conflicts with it, replaces it, and provides it) is assigned
this score.

Option:Aptitude::ProblemResolver::FutureHorizon

Default:50

Description: How many “steps” the resolver should run after finding the first
solution. Although aptitude attempts to generate better solutions before worse
solutions, sometimes it is unable to do so; this setting causes the resolver to
briefly continue searching for a better solution before displaying its results,
rather than stopping immediately after it finds the first solution.

Option:Aptitude::ProblemResolver::Hints

Default:(empty)

Description: This option is a group whose members are used to configure the
problem resolver. Each item in the group is a string describing an action that
should be applied to one or more packages. The syntax for each hint, and the
effect that hints have, may be found in the section called “Configuring resolver
hints”.

Option:Aptitude::ProblemResolver::ImportantScore

Default:4

Description: Any version of a package whose Priority is “important” will have
this many points added to its score.

Option:Aptitude::ProblemResolver::Infinity

Default:1000000

Description: A “maximum” score for potential solutions. If a set of actions has
a score worse than -Infinity, it will be discarded immediately.

Option:Aptitude::ProblemResolver::InstallScore

Default:-20

Description: How much weight the problem resolver should give to installing a
package, if the package is not already going to be installed.

Option:Aptitude::ProblemResolver::Keep-All-Level

Default:10000

Description: The safety cost assigned to the single solution that cancels all of
the actions selected by the user. See the section called “Safety costs” for a
description of safety costs.

Option:Aptitude::ProblemResolver::KeepScore

Default:0

Description: How much weight the problem resolver should give to keeping a
package in its current state, if that package is not already going to be kept in
its current state.

Option:Aptitude::ProblemResolver::NonDefaultScore

Default:-40

Description: How much weight the problem resolver should give to installing a
non-default version of the package (one that is not the current version and not
the “candidate version”).

Option:Aptitude::ProblemResolver::Non-Default-Level

Default:50000

Description: The safety cost assigned to actions that install non-default
versions of a package. For instance, if version 5 of a package is installed,
versions 6, 7, and 8 are available, and version 7 is the default version, then
versions 6 and 8 will be given a safety cost that is at least this high. See the
section called “Safety costs” for a description of safety costs.

Option:Aptitude::ProblemResolver::OptionalScore

Default:1

Description: Any version of a package whose Priority is “optional” will have
this many points added to its score.

Option:Aptitude::ProblemResolver::PreserveAutoScore

Default:0

Description: How much weight the problem resolver should give to preserving
automatic installations or removals.

Option:Aptitude::ProblemResolver::PreserveManualScore

Default:20

Description: How much weight the problem resolver should give to preserving
explicit user selections.

Option:Aptitude::ProblemResolver::RemoveObsoleteScore

Default:310

Description: How much weight the problem resolver should give to removing an
obsolete package (if it is not already marked for removal). It should at least
counter RemoveScore, because it will still be applied.

Option:Aptitude::ProblemResolver::RemoveScore

Default:-300

Description: How much weight the problem resolver should give to removing a
package (if it is not already marked for removal).

Option:Aptitude::ProblemResolver::Remove-Level

Default:10000

Description: The safety cost assigned to actions that remove a package. See the
section called “Safety costs” for a description of safety costs.

Option:Aptitude::ProblemResolver::RequiredScore

Default:8

Description: Any version of a package whose Priority is “required” will have
this many points added to its score.

Option:Aptitude::ProblemResolver::ResolutionScore

Default:50

Description: In addition to all other scoring factors, proposed solutions that
actually resolve all unsatisfied dependencies are awarded this many extra
points.

Option:Aptitude::ProblemResolver::Safe-Level

Default:10000

Description: The safety cost assigned to actions that install the default
version of a package, upgrade a package to its default version, or cancel
installing or upgrading a package. Solutions assigned this cost could be
generated by aptitude safe-upgrade. See the section called “Safety costs” for a
description of safety costs.

Option:Aptitude::ProblemResolver::SolutionCost

Default:safety,priority

Description: Describes how to determine the cost of a solution. See the section
called “Costs in the interactive dependency resolver” for a description of what
solution costs are, what they do, and the syntax used to specify them. If the
cost cannot be parsed, an error is issued and the default cost is used instead.

Option:Aptitude::ProblemResolver::StandardScore

Default:2

Description: Any version of a package whose Priority is “standard” will have
this many points added to its score.

Option:Aptitude::ProblemResolver::StepLimit

Default:5000

Description: The maximum number of “steps” which should be performed by the
problem resolver on each attempt to find a solution to a dependency problem.
Decreasing this number will make aptitude “give up” sooner; increasing it will
permit the search for a solution to consume much more time and memory before it
is aborted. Setting StepLimit to 0 will disable the problem resolver entirely.
The default value is large enough to accomodate commonly encountered situations,
while preventing aptitude from “blowing up” if an overly complicated problem is
encountered. (note: this applies only to command-line searches; in the visual
interface, the resolver will continue working until it reaches a solution)

Option:Aptitude::ProblemResolver::StepScore

Default:-10

Description: How much to reward or penalize prospective solutions based on their
length. For each action performed by a solution, these many points are added to
its score. The larger this value is, the more the resolver tends to stick with
its first choice rather than considering alternatives; this will cause it to
produce a solution more quickly, but the solution might be of slightly lower
quality than it would otherwise be.

Option:Aptitude::ProblemResolver::Trace-Directory

Default:

Description: If this value is set, then each time the problem resolver produces
a solution, a stripped-down version of the package state sufficient to reproduce
that solution is written to the given file. If Aptitude::ProblemResolver::Trace-
File is also set, the same information will also be written to the trace file.
Trace directories are more transparent than trace files, and are more suitable
for, e.g., including in source trees as test cases.

Option:Aptitude::ProblemResolver::Trace-File

Default:

Description: If this value is set, then each time the problem resolver produces
a solution, a stripped-down version of the package state sufficient to reproduce
that solution is written to the given file. If Aptitude::ProblemResolver::Trace-
Directory is also set, the same information will also be written to the trace
directory. A trace file is simply a compressed archive of a trace directory; it
will take less space than the trace directory and is suitable for transmission
over a network.

Option:Aptitude::ProblemResolver::UndoFullReplacementScore

Default:-500

Description: Installing a package and removing another package that fully
replaces it (i.e., conflicts with it, replaces it, and provides it) is assigned
this score.

Option:Aptitude::ProblemResolver::UnfixedSoftScore

Default:-200

Description: How much to reward or penalize leaving a Recommends relationship
unresolved. This should typically be less than RemoveScore, or aptitude will
tend to remove packages rather than leaving their Recommendations unfixed. See
the section called “Resolving Dependencies Interactively” for details.

Option:Aptitude::ProblemResolver::UpgradeScore

Default:30

Description: How much weight the problem resolver should give to upgrading (or
downgrading) a package to its candidate version, if the package was not already
going to be upgraded.

Option:Aptitude::Purge-Unused

Default:false

Description: If this option is true and Aptitude::Delete-Unused is also true,
then packages which are unused will be purged from the system, removing their
configuration files and perhaps other important data. For more information about
which packages are considered to be “unused”, see the section called “Managing
automatically installed packages”. THIS OPTION CAN CAUSE DATA LOSS! DO NOT
ENABLE IT UNLESS YOU KNOW WHAT YOU ARE DOING!

Option:Aptitude::Recommends-Important

Default:true

Description: This is an obsolete configuration option that has been superseded
by APT::Install-Recommends. On startup, aptitude will copy Aptitude::Recommends-
Important (if it exists) to APT::Install-Recommends and then clear Aptitude::
Recommends-Important in your user configuration file.

Option:Aptitude::Safe-Resolver::No-New-Installs

Default:false

Description: If this option is true, then when the “safe” dependency resolver
has been activated via --safe-resolver or by using the safe-upgrade command-line
action, the resolver will not be allowed to install packages that are not
currently installed.

Option:Aptitude::Safe-Resolver::No-New-Upgrades

Default:false

Description: If this option is enabled, then when the “safe” dependency resolver
has been activated via --safe-resolver or by using the safe-upgrade command-line
action, the resolver will not be allowed to resolve dependencies by upgrading
packages.

Option:Aptitude::Sections::Descriptions

Default:See $prefix/share/aptitude/section-descriptions

Description: This option is a group whose members define the descriptions
displayed for each section when using the “section” package hierarchy grouping
policy. Descriptions are assigned to section trees based on the last component
of the name: for instance, a member of this group named “games” will be used to
describe the Sections “games”, “non-free/games”, and “non-free/desktop/games”.
Within the text of section descriptions, the string “\n” will be replaced by a
line-break, and the string “''” will be replaced by a double-quote character.

Option:Aptitude::Sections::Top-Sections

Default:"main"; "contrib"; "non-free"; "non-US";

Description: A configuration group whose elements are the names of the top-level
archive sections. The “topdir”, “subdir”, and “subdirs” grouping policies use
this list to interpret Section fields: if the first path element of a package's
Section is not contained in this list, or if its Section has only one element,
then the package will be grouped using the first member of this list as its
first path element. For example, if the first member of Top-Sections is “main”,
then a package whose Section is “games/arcade” will be treated as if its Section
field were “main/games/arcade”.

Option:Aptitude::Simulate

Default:false

Description: In command-line mode, causes aptitude to just display the actions
that would be performed (rather than actually performing them); in the visual
interface, causes aptitude to start in read-only mode regardless of whether you
are root or not. This is equivalent to the -s command-line option.

Option:Aptitude::Spin-Interval

Default:500

Description: The number of milliseconds to delay in between updating the
“spinner” that appears while the problem resolver is running.

Option:Aptitude::Suggests-Important

Default:false

Description: This is an obsolete option; use APT::AutoRemove::SuggestsImportant
instead. Setting this option to true has the same effect as setting APT::
AutoRemove::SuggestsImportant to true.

Option:Aptitude::Suppress-Read-Only-Warning

Default:false

Description: If this option is false, aptitude will display a warning the first
time that you attempt to modify package states while aptitude is in read-only
mode.

Option:Aptitude::Theme

Default:

Description: The theme that aptitude should use; see the section called “Themes”
for more information.

Option:Aptitude::Track-Dselect-State

Default:true

Description: If this option is set to true, aptitude will attempt to detect when
a change to a package's state has been made using dselect or dpkg: for instance,
if you remove a package using dpkg, aptitude will not try to reinstall it. Note
that this may be somewhat buggy.

Option:Aptitude::UI::Advance-On-Action

Default:false

Description: If this option is set to true, changing a package's state (for
instance, marking it for installation) will cause aptitude to advance the
highlight to the next package in the current group.

Option:Aptitude::UI::Auto-Show-Reasons

Default:true

Description: If this option is set to true, selecting a package which is broken
or which appears to be causing other packages to be broken will cause the
information area to automatically display some reasons why the breakage might be
occuring.

Option:Aptitude::UI::Default-Grouping

Default:filter(missing),status,section(subdirs,passthrough),section(topdir)

Description: Sets the default grouping policy used for package lists. See the
section called “Customizing the package hierarchy” for additional information on
grouping policies.

Option:Aptitude::UI::Default-Package-View

Default:

Description: This option is a group whose members define the default layout of
aptitude's display. See the section called “Customizing the display layout” for
more information.

Option:Aptitude::UI::Default-Preview-Grouping

Default:action

Description: Sets the default grouping policy used for preview screens. See the
section called “Customizing the package hierarchy” for additional information on
grouping policies.

Option:Aptitude::UI::Default-Sorting

Default:name

Description: The default sorting policy of package views. See the section called
“Customizing how packages are sorted” for more information.

Option:Aptitude::UI::Description-Visible-By-Default

Default:true

Description: When a package list is first displayed, the information area (which
typically contains the long description of the current package) will be visible
if this option is true and hidden if it is false.

Option:Aptitude::UI::Exit-On-Last-Close

Default:true

Description: If this option is true, closing all the active views will quit
aptitude; otherwise, aptitude will not exit until you issue the command Actions
→ Quit (Q). See the section called “Working with multiple views” for more
information.

Option:Aptitude::UI::Fill-Text

Default:false

Description: If this option is true, aptitude will format descriptions so that
each line is exactly the width of the screen.

Option:Aptitude::UI::Flat-View-As-First-View

Default:false

Description: If this option is true, aptitude will display a flat view on
startup instead of the default view.

Option:Aptitude::UI::HelpBar

Default:true

Description: If this option is true, a line of information about important
keystrokes will be displayed at the top of the screen.

Option:Aptitude::UI::Incremental-Search

Default:true

Description: If this option is true, aptitude will perform “incremental”
searches: as you type the search pattern, it will search for the next package
matching what you have typed so far.

Option:Aptitude::UI::InfoAreaTabs

Default:false

Description: If this option is true, aptitude will display tabs at the top of
the information area (the pane at the bottom of the screen) describing the
different modes the area can be set to.

Option:Aptitude::UI::Keybindings

Default:

Description: This is a group whose members define the connections between
keystrokes and commands in aptitude. For more information, see the section
called “Customizing keybindings”.

Option:Aptitude::UI::Menubar-Autohide

Default:false

Description: If this option is set to true, the menu bar will be hidden while it
is not in use.

Option:Aptitude::UI::Minibuf-Download-Bar

Default:false

Description: If this option is set to true, aptitude will use a less obtrusive
mechanism to display the progress of downloads: a bar at the bottom of the
screen will appear which displays the current download status. While the
download is active, pressing q will abort it.

Option:Aptitude::UI::Minibuf-Prompts

Default:false

Description: If this option is true, some prompts (such as yes/no and multiple-
choice prompts) will be displayed at the bottom of the screen instead of in
dialog boxes.

Option:Aptitude::UI::New-Package-Commands

Default:true

Description: If this option is set to false, commands such as Package → Install
(+) will have the same deprecated behavior that they did in antique versions of
aptitude.

Option:Aptitude::UI::Package-Display-Format

Default:%c%a%M %p %Z %v %V

Description: This option controls the format string used to display packages in
package lists. For more information on format strings, see the section called
“Customizing how packages are displayed”.

Option:Aptitude::UI::Package-Header-Format

Default:%N %n @ %H #%B %u %o

Description: This option controls the format string used to display the header
line of package lists (ie, the line that appears between the package list and
the menu bar). For more information on format strings, see the section called
“Customizing how packages are displayed”.

Option:Aptitude::UI::Package-Status-Format

Default:%d

Description: This option controls the format string used to display the status
line of package lists (ie, the line that appears between the package list and
the information area). For more information on format strings, see the section
called “Customizing how packages are displayed”.

Option:Aptitude::UI::Pause-After-Download

Default:OnlyIfError

Description: If this option is true, aptitude will display a message after it
finishes downloading packages, asking you if you want to continue with the
installation. If it is OnlyIfError, a message will only be displayed if a
download failed. Otherwise, if the option is set to false, aptitude will
immediately proceed to the next screen after completing a download.

Option:Aptitude::UI::Preview-Limit

Default:

Description: The default filter applied to the preview screen; see the section
called “Search patterns” for details about its format.

Option:Aptitude::UI::Prompt-On-Exit

Default:true

Description: If this option is true, aptitude will display a confirmation prompt
before shutting down.

Option:Aptitude::UI::Styles

Default:

Description: This is a configuration group whose contents define what textual
styles aptitude uses to display information. For more information, see the
section called “Customizing text colors and styles”.

Option:Aptitude::UI::ViewTabs

Default:true

Description: If this option is set to false, aptitude will not display “tabs”
describing the currently active views at the top of the screen.

Option:Aptitude::Warn-Not-Root

Default:true

Description: If this option is true, aptitude will detect when you need root
privileges to do something, and ask you whether you want to switch to the root
account if you aren't root already. See the section called “Becoming root” for
more information.

Option:DebTags::Vocabulary

Default:/usr/share/debtags/vocabulary

Description: The location of the debtags vocabulary file; used to load in the
package tag metadata.

Option:Dir::Aptitude::state

Default:/var/lib/aptitude

Description: The directory in which aptitude's persistent state information is
stored.

Option:Quiet

Default:0

Description: This controls the quietness of the command-line mode. Setting it to
a higher value will disable more progress indicators.


Themes

A theme in aptitude is simply a collection of settings that “go together”.
Themes work by overriding the default values of options: if an option is not set
in the system configuration file or in your personal configuration file,
aptitude will use the setting from the current theme, if one is available,
before using the standard default value.

A theme is simply a named group under Aptitude::Themes; each configuration
option contained in the group will override the corresponding option in the
global configuration. For instance, if the Dselect theme is selected, the option
Aptitude::Themes::Dselect::Aptitude::UI::Package-Display-Format will override
the default value of the option Aptitude::UI::Package-Display-Format.

To select a theme, set the configuration option Aptitude::Theme to the name of
the theme; for instance,

Aptitude::Theme Vertical-Split;

The following themes are shipped with aptitude in /usr/share/aptitude/aptitude-
defaults:



  Dselect
      This theme makes aptitude look and behave more like the legacy dselect
      package manager:

       Actions  Undo  Package  Search  Options  Views  Help
      f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
      --\ Installed Packages
        --\ Priority required
          --\ base - The Debian base system
      c   base  base-file 3.0.16      3.0.16      Debian base system
      miscellaneous fil
      c   base  base-pass 3.5.7       3.5.7       Debian base system master
      password a
      c   base  bash      2.05b-15    2.05b-15    The GNU Bourne Again SHell
      c   base  bsdutils  1:2.12-7    1:2.12-7    Basic utilities from 4.4BSD-
      Lite
      c   base  coreutils 5.0.91-2    5.0.91-2    The GNU core utilities
      c   base  debianuti 2.8.3       2.8.3       Miscellaneous utilities
      specific to
      c   base  diff      2.8.1-6     2.8.1-6     File comparison utilities
      base-files                      installed ; none
      required
      This package contains the basic filesystem hierarchy of a Debian system,
      and
      several important miscellaneous files, such as /etc/debian_version,
      /etc/host.conf, /etc/issue, /etc/motd, /etc/profile, /etc/nsswitch.conf,
      and
      others, and the text of several common licenses in use on Debian systems.







  Vertical-Split
      This theme rearranges the display: instead of the current package's
      description appearing underneath the package list, it is displayed to the
      right of the package list. This theme is useful with very wide terminals,
      and perhaps also when editing the built-in hierarchy of packages.

       Actions  Undo  Package  Search  Options  Views  Help
      f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
      aptitude 0.2.14.1
      --\ Installed Packages                  Modern computers support the
      Advanced  #
        --\ admin - Administrative utilities  Configuration and Power Interface
          --\ main - The main Debian archive  (ACPI) to allow intelligent power
      i   acpid         1.0.3-19   1.0.3-19   management on your system and to
      query
      i   alien         8.44       8.44       battery and configuration status.
      i   anacron       2.3-9      2.3-9
      i   apt-show-vers 0.07       0.07       ACPID is a completely flexible,
      totally
      i A apt-utils     0.5.25     0.5.25     extensible daemon for delivering
      ACPI
      i   apt-watch     0.3.2-2    0.3.2-2    events. It listens on a file
      i   aptitude      0.2.14.1-2 0.2.14.1-2 (/proc/acpi/event) and when an
      event
      i   at            3.1.8-11   3.1.8-11   occurs, executes programs to
      handle the
      i   auto-apt      0.3.20     0.3.20     event. The programs it executes
      are
      i   cron          3.0pl1-83  3.0pl1-83  configured through a set of
      i   debconf       1.4.29     1.4.29     configuration files, which can be
      i   debconf-i18n  1.4.29     1.4.29     dropped into place by packages or
      by
      i A debootstrap   0.2.39     0.2.39     the admin.
      i A deborphan     1.7.3      1.7.3
      i   debtags       0.16       0.16       In order to use this package you
      need a
      i A defoma        0.11.8     0.11.8     recent Kernel (=>2.4.7). This can
      be
      i   discover      2.0.4-5    2.0.4-5    one including the patches on
      Utilities for using ACPI power management



Playing Minesweeper

In case you get tired of installing and removing packages, aptitude includes a
version of the classic game “Minesweeper”. To start it, select Actions → Play
Minesweeper; the initial Minesweeper board will appear:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
Minesweeper                                              10/10 mines  13 seconds





                                   +--------+
                                   |        |
                                   |        |
                                   |        |
                                   |        |
                                   |        |
                                   |        |
                                   |        |
                                   |        |
                                   +--------+





Within the rectangle that appears on the screen are hidden ten mines. Your goal
is to determine, through intuition, logic, and luck, where those mines are,
without setting any of them off! To do this, you must uncover all the squares
that do not contain mines; in doing so, you will learn important information
regarding which squares do contain mines. Beware, however: uncovering a square
that contains a mine will set it off, ending your game immediately!

To uncover a square (and find out whether a mine is hidden there), select the
square with the arrow keys and press Enter:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
Minesweeper                                             10/10 mines  387 seconds





                                   +--------+
                                   | 2......|
                                   | 2111...|
                                   |    1...|
                                   | 1111...|
                                   |11...111|
                                   |...113  |
                                   |1122    |
                                   |        |
                                   +--------+





As you can see, some of the hidden (blank) parts of the board have been revealed
in this screenshot. The squares containing a . are squares which are not next to
any mines; the numbers in the remaining squares indicate how many mines they are
next to.

If you think you know where a mine is, you can place a “flag” on it. To do this,
select the suspected square and press f. For instance, in the screenshot below,
I decided that the square on the left-hand side of the board looked
suspicious...

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
Minesweeper                                              9/10 mines  961 seconds





                                   +--------+
                                   | 2......|
                                   | 2111...|
                                   |    1...|
                                   |F1111...|
                                   |11...111|
                                   |...113  |
                                   |1122    |
                                   |        |
                                   +--------+





As you can see, an F appeared in the selected square. It is no longer possible
to uncover this square, even accidentally, until the flag is removed (by
pressing f again). Once you have placed flags on all the mines that are next to
a square (for instance, the squares labelled 1 next to the flag above), you can
“sweep” around the square. This is just a convenient shortcut to uncover all the
squares next to it (except those containing a flag, of course). For instance,
sweeping around the 1 above:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
Minesweeper                                              9/10 mines  2290
seconds





                                   +--------+
                                   | 2......|
                                   | 2111...|
                                   |221 1...|
                                   |F1111...|
                                   |11...111|
                                   |...113  |
                                   |1122    |
                                   |        |
                                   +--------+





Luckily (or was it luck?), my guess about the location of that mine was correct.
If I had been wrong, I would have lost immediately:

 Actions  Undo  Package  Search  Options  Views  Help
f10: Menu  ?: Help  q: Quit  u: Update  g: Download/Install/Remove Pkgs
Minesweeper                                   Minesweeper    Lost in 2388
seconds





                                   +--------+
                                   |^2......|
                                   |^2111...|
                                   |221^1...|
                                   |^1111...|
                                   |11...111|
                                   |...113^ |
                                   |1122* ^ |
                                   | ^ ^   ^|
                                   +--------+





When you lose, the locations of all the mines are revealed: unexploded mines are
indicated by a caret symbol (^), and the one you “stepped on” is indicated by an
asterisk (*).



--------------------------------------------------------------------------------
[7]I am pleased to say that the number of requests of this sort fell off
precipitously following the initial publication of this Guide. It would be a
happy occurrence if there was a connection between the two events.

[8]This is sometimes referred to as an “install run”, even though you might be
upgrading or removing packages in addition to installing them.

[9]As noted above, it does not indicate that the packages in the archive are
secure, or even non-malicious; it merely shows that they are genuine.

[10] More precisely: they will be removed when there is no path via Depends,
PreDepends, or Recommends to them from a manually installed package. If APT::
AutoRemove::SuggestsImportant is true, a Suggests relationship is also enough to
keep a package installed.

[11]Or when immediate resolution is disabled.

[12]The package with the highest dpkg priority, not the package with the highest
apt pin priority.

[13]This limit was imposed because more complex cost structures could make it
difficult to optimize the resolver. Future versions of the program might remove
some of the restrictions if they turn out to be unnecessary.

[14] aptitude will only treat the comma as special if there is a second
argument, so (for instance) “?name(apt,itude)” searches for the string
“apt,itude” in the Name field of packages.

While this behavior is well-defined, it may be surprising; I recommend using
quoted strings for any pattern that contains characters that could have a
special meaning.

[15] Characters with a special meaning include: “+”, “-”, “.”, “(”, “)”, “|”, “
[”, “]”, “^”, “$”, and “?”. Note that some of these are also aptitude
metacharacters, so if you want to type (for instance) a literal “|”, it must be
double-escaped: “?description(\~|)” will match packages whose description
contains a vertical bar character (“|”).

[16] The backslash escapes \\, \n, and \t are also available.

[17] Astute readers will note that this is essentially a way to explicitly name
the variable in the λ-terms corresponding to the term. A typical term would have
the form “λ x . name-equals(x, pattern)”; giving this an explicit target makes x
visible in the search language.

[18] This is provided largely for symmetry with ?true.

[19]Currently tagging is not supported; this escape is for future use.

[20] On some terminals, a “yellow” background will actually come out brown.



Chapter 3. aptitude frequently asked questions


  “What ... is your name?”                                    

   “I am Arthur, King of the Britons.”

   “What ... is your quest?”

   “I seek the Holy Grail!”

   “What ... is the airspeed velocity of an unladen swallow?”

   “What do you mean? An African or a European swallow?”

   “Huh? I ... I don't kn---AAAAAUUUGGGHH!”

                                 -- Monty Python and the Holy Grail




  3.1. How can I find exactly one package by name?

  3.2. How can I find broken packages?

  3.3. I want to select text, why doesn't aptitude let me disable the mouse?


3.1. How can I find exactly one package by name?

     As mentioned in the section called “Search patterns”, when you search for a
     package by name, the text you enter is actually a regular expression. Thus, the
     search pattern “^name$” will match only a package named name.

     For instance, you can find apt (but not aptitude or synaptic) by entering
     ^apt$; you can find g++ (but not g++-2.95 or g++-3.0) by entering ^g\+\+$.

3.2. How can I find broken packages?

     Use the command Search → Find Broken (b).

3.3. I want to select text, why doesn't aptitude let me disable the mouse?

     Normally, you cannot select text in an xterm while a program running in that
     terminal (such as aptitude) is using the mouse. However, you can override this
     behavior and perform a selection by holding the Shift key down while you click
     on the terminal.




Chapter 4. Credits


  No-one remembers the singer. The song remains.  

                  -- Terry Pratchett, The Last Hero


This section commemorates some of the people who have contributed to aptitude
over its lifetime.


IMG.alt.suffix = \[Note]] Note

                          This section is presently rather incomplete and will
                          likely be updated and expanded as time goes on (in
                          particular, there are many missing translation credits
                          due to the huge number of sources of translations
                          [21]). If you think you should be on this list, please
                          email <dburrows@debian.org> with an explanation of why
                          you think so.


Translations and internationalization



  Brazilian translation
      Andre Luis Lopes, Gustavo Silva


  Chinese translation
      Carlos Z.F. Liu


  Czech translation
      Miroslav Kure


  Danish translation
      Morten Brix Pedersen, Morten Bo Johansen


  Dutch translation
      Luk Claes


  Finnish translation
      Jaakko Kangasharju


  French translation
      Martin Quinson, Jean-Luc Coulon


  German translation
      Sebastian Schaffert, Erich Schubert, Sebastian Kapfer, Jens Seidel


  Italian translation
      Danilo Piazzalunga


  Japanese translation
      Yasuo Eto, Noritada Kobayashi


  Lithuanian translation
      Darius ?itkevicius


  Polish translation
      Michal Politowski


  Portuguese translation
      Nuno Sénica, Miguel Figueiredo


  Norwegian translation
      Håvard Korsvoll


  Spanish translation
      Jordi Malloch, Ruben Porras


  Swedish translation
      Daniel Nylander


  Initial i18n patch
      Masato Taruishi


  i18n triaging and maintainence
      Christian Perrier


Documentation



  User's Manual
      Daniel Burrows


Programming



  Program design and implementation
      Daniel Burrows


  Support for the dpkg Breaks field
      Ian Jackson, Michael Vogt




--------------------------------------------------------------------------------
[21] It should be possible to compile a fairly complete list of i18n
contributors based on the ChangeLog, its references to the Debian bug tracking
system, and the revision history of aptitude, but doing so will require a large
investment of time that is not currently available.



Command-line reference

--------------------------------------------------------------------------------
Table of Contents



  aptitude — high-level interface to the package manager

  aptitude-create-state-bundle — bundle the current aptitude state

  aptitude-run-state-bundle — unpack an aptitude state bundle and invoke
  aptitude on it


Name

aptitude — high-level interface to the package manager


Synopsis

aptitude [options...] { autoclean | clean | forget-new | keep-all | update }

aptitude [options...] { full-upgrade | safe-upgrade } [packages...]

aptitude [options...] { build-dep | build-depends | changelog | download |
forbid-version | hold | install | markauto | purge | reinstall | remove | show |
showsrc | source | unhold | unmarkauto | versions } packages...

aptitude extract-cache-subset output-directory packages...

aptitude [options...] search patterns...

aptitude [options...] { add-user-tag | remove-user-tag } tag packages...

aptitude [options...] { why | why-not } [patterns...] package

aptitude [-S fname] [ --autoclean-on-startup | --clean-on-startup | -i | -u ]

aptitude help


Description

aptitude is a text-based interface to the Debian GNU/Linux package system.

It allows the user to view the list of packages and to perform package
management tasks such as installing, upgrading, and removing packages. Actions
may be performed from a visual interface or from the command-line.


Command-line actions

The first argument which does not begin with a hyphen (“-”) is considered to be
an action that the program should perform. If an action is not specified on the
command-line, aptitude will start up in visual mode.

The following actions are available:



  install
      Install one or more packages. The packages should be listed after the
      “install” command; if a package name contains a tilde character (“~”) or a
      question mark (“?”), it will be treated as a search pattern and every
      package matching the pattern will be installed (see the section “Search
      Patterns” in the aptitude reference manual).

      To select a particular version of the package, append “=version” to the
      package name: for instance, “aptitude install apt=0.3.1”. Similarly, to
      select a package from a particular archive, append “/archive” to the
      package name: for instance, “aptitude install apt/experimental”. You
      cannot specify both an archive and a version for a package.

       Not every package listed on the command line has to be installed; you can
      tell aptitude to do something different with a package by appending an
      “override specifier” to the name of the package. For example, aptitude
      remove wesnoth+ will install wesnoth, not remove it. The following
      override specifiers are available:



        package+
            Install package.

            If the package was not installed, it is marked as manually
            installed, and the dependencies newly installed are marked with the
            automatic flag. If the package or the dependencies were already
            installed, the automatic flag is preserved. See the section about
            automatic installations in the documentation for more information.


        package+M
            Install package and immediately mark it as automatically installed
            (note that if nothing depends on package, this will cause it to be
            immediately removed).


        package-
            Remove package.


        package_
            Purge package: remove it and all its associated configuration and
            data files.


        package=
            Place package on hold: cancel any active installation, upgrade, or
            removal, and prevent this package from being automatically upgraded
            in the future.


        package:
            Keep package at its current version: cancel any installation,
            removal, or upgrade. Unlike “hold” (above) this does not prevent
            automatic upgrades in the future.


        package&M
            Mark package as having been automatically installed.


        package&m
            Mark package as having been manually installed.


        package&BD
            Install the build-dependencies of a package.


      As a special case, “install” with no arguments will act on any stored/
      pending actions.


      IMG.alt.suffix Note
        = \[Note]]
                     Once you enter Y at the final confirmation prompt, the “install” command
                     will modify aptitude's stored information about what actions to perform.
                     Therefore, if you issue (e.g.) the command “aptitude install foo bar” on
                     packages previously uninstalled, and then the installation fails once
                     aptitude has started downloading and installing packages, you will need to
                     run “aptitude remove foo bar” to go back to the previous state (and possibly
                     undo installations or upgrades to other packages that were affected by the
                     “install” action).



  remove, purge, reinstall
      These commands are the same as “install”, but apply the named action to
      all packages given on the command line for which it is not overridden.

      For instance, “aptitude remove '~ndeity'” will remove all packages whose
      name contains “deity”.


  build-depends, build-dep
      Satisfy the build-dependencies of a package. Each package name may be a
      source package, in which case the build dependencies of that source
      package are installed; otherwise, binary packages are found in the same
      way as for the “install” command, and the build-dependencies of the source
      packages that build those binary packages are satisfied.

      If the command-line parameter --arch-only is present, only architecture-
      dependent build dependencies (i.e., not Build-Depends-Indep or Build-
      Conflicts-Indep) will be obeyed.


  markauto, unmarkauto
      Mark packages as automatically installed or manually installed,
      respectively. Packages are specified in exactly the same way as for the
      “install” command. For instance, “aptitude markauto '~slibs'” will mark
      all packages in the “libs” section as having been automatically installed.

      For more information on automatically installed packages, see the section
      “Managing Automatically Installed Packages” in the aptitude reference
      manual.


  hold, unhold, keep
      Mark packages to be on hold, remove this property, or set to keep in the
      current state. Packages are specified in exactly the same way as for the
      “install” command. For instance, “aptitude hold '~e^dpkg$'” will mark all
      packages coming from the source package “dpkg” to be on hold.

      The difference between hold and keep is that hold will cause a package to
      be ignored by future safe-upgrade or full-upgrade commands, while keep
      merely cancels any scheduled actions on the package. unhold will allow a
      package to be upgraded by future safe-upgrade or full-upgrade commands,
      without otherwise altering its state.


  keep-all
      Cancels all scheduled actions on all packages; any packages whose sticky
      state indicates an installation, removal, or upgrade will have this sticky
      state cleared.


  forget-new
      Forgets all internal information about what packages are “new” (equivalent
      to pressing “f” when in visual mode).

      This command accepts package names or patterns as arguments. If the string
      contains a tilde character (“~”) or a question mark (“?”), it will be
      treated as a search pattern and every package matching the pattern will be
      considered (see the section “Search Patterns” in the aptitude reference
      manual).


  forbid-version
      Forbid a package from being upgraded to a particular version, while
      allowing automatic upgrades to future versions. This is useful for example
      to avoid a known broken version of a package, without having to set and
      clear manual holds.

      By default, aptitude will select the forbidden version to be the one which
      the package would normally be upgraded (the candidate version). This may
      be overridden by appending “=version” to the package name: for instance,
      “aptitude forbid-version vim=1.2.3.broken-4”.

      To revert the action, “aptitude install package” will remove the ban. To
      remove the forbidden version without installing the candidate version, the
      current version should be appended: “install package=version”.


  update
      Updates the list of available packages from the apt sources (this is
      equivalent to “apt-get update”)


  safe-upgrade
      Upgrades installed packages to their most recent version. Installed
      packages will not be removed unless they are unused (see the section
      “Managing Automatically Installed Packages” in the aptitude reference
      manual). Packages which are not currently installed may be installed to
      resolve dependencies unless the --no-new-installs command-line option is
      supplied.

      If no packages are listed on the command line, aptitude will attempt to
      upgrade every package that can be upgraded. Otherwise, aptitude will
      attempt to upgrade only the packages which it is instructed to upgrade.
      The packages can be extended with suffixes in the same manner as arguments
      to aptitude install, so you can also give additional instructions to
      aptitude here; for instance, aptitude safe-upgrade bash dash- will attempt
      to upgrade the bash package and remove the dash package.

      It is sometimes necessary to remove one package in order to upgrade
      another; this command is not able to upgrade packages in such situations.
      Use the full-upgrade command to upgrade as many packages as possible.


  full-upgrade
      Upgrades installed packages to their most recent version, removing or
      installing packages as necessary. It also installs new Essential or
      Required packages. This command is less conservative than safe-upgrade and
      thus more likely to perform unwanted actions. However, it is capable of
      upgrading packages that safe-upgrade cannot upgrade.

      If no packages are listed on the command line, aptitude will attempt to
      upgrade every package that can be upgraded. Otherwise, aptitude will
      attempt to upgrade only the packages which it is instructed to upgrade.
      The packages can be extended with suffixes in the same manner as arguments
      to aptitude install, so you can also give additional instructions to
      aptitude here; for instance, aptitude full-upgrade bash dash- will attempt
      to upgrade the bash package and remove the dash package.


      IMG.alt.suffix = \[Note]] Note

                                This command was originally named dist-upgrade
                                for historical reasons, and aptitude still
                                recognizes dist-upgrade as a synonym for full-
                                upgrade.



  search
      Searches for packages matching one of the patterns supplied on the command
      line. All packages which match any of the given patterns will be
      displayed; for instance, “aptitude search '~N' edit” will list all “new”
      packages and all packages whose name contains “edit”. For more information
      on search patterns, see the section “Search Patterns” in the aptitude
      reference manual.


      IMG.alt.suffix Note
        = \[Note]]
                     In the example above, “aptitude search '~N' edit” has two arguments after
                     search and thus is searching for two patterns: “~N” and “edit”. As described
                     in the search pattern reference, a single pattern composed of two sub-
                     patterns separated by a space (such as “~N edit”) matches only if both
                     patterns match. Thus, the command “aptitude search '~N edit'” will only show
                     “new” packages whose name contains “edit”.


      Unless you pass the -F option, the output of aptitude search will look
      something like this:

      i   apt                             - Advanced front-end for dpkg
      pi  apt-build                       - frontend to apt to build, optimize
      and in
      cp  apt-file                        - APT package searching utility -
      - command-
      ihA raptor-utils                    - Raptor RDF Parser utilities

      Each search result is listed on a separate line. The first character of
      each line indicates the current state of the package: the most common
      states are p, meaning that no trace of the package exists on the system,
      c, meaning that the package was deleted but its configuration files remain
      on the system, i, meaning that the package is installed, and v, meaning
      that the package is virtual. The second character indicates the stored
      action (if any; otherwise a blank space is displayed) to be performed on
      the package, with the most common actions being i, meaning that the
      package will be installed, d, meaning that the package will be deleted,
      and p, meaning that the package and its configuration files will be
      removed. If the third character is A, the package was automatically
      installed.

      For a complete list of the possible state and action flags, see the
      section “Accessing Package Information” in the aptitude reference guide.
      To customize the output of search, see the command-line options -F and --
      sort.


  show
      Displays detailed information about one or more packages. If a package
      name contains a tilde character (“~”) or a question mark (“?”), it will be
      treated as a search pattern and all matching packages will be displayed
      (see the section “Search Patterns” in the aptitude reference manual).

      If the verbosity level is 1 or greater (i.e., at least one -v is present
      on the command-line), information about all versions of the package is
      displayed. Otherwise, information about the “candidate version” (the
      version that “aptitude install” would download) is displayed.

      You can display information about a different version of the package by
      appending =version to the package name; you can display the version from a
      particular archive or release by appending /archive or /release to the
      package name: for instance, /unstable or /sid. If either of these is
      present, then only the version you request will be displayed, regardless
      of the verbosity level.

      If the verbosity level is 1 or greater, the package's architecture,
      compressed size, filename, and md5sum fields will be displayed. If the
      verbosity level is 2 or greater, the select version or versions will be
      displayed once for each archive in which they are found.


  showsrc
      Displays detailed information about one or more source packages.

      This is a thin wrapper over apt(8).


  source
      Downloads one or more source packages.

      This is a thin wrapper over apt(8).


  versions
      Displays the versions of the packages listed on the command-line.

      $ aptitude versions wesnoth
      p   1:1.4.5-
      1                                                             100
      p   1:1.6.5-1                                    unstable
      500
      p   1:1.7.14-1                                   experimental
      1

      Each version is listed on a separate line. The leftmost three characters
      indicate the current state, planned state (if any), and whether the
      package was automatically installed; for more information on their
      meanings, see the documentation of aptitude search. To the right of the
      version number you can find the releases from which the version is
      available, and the pin priority of the version.

      If a package name contains a tilde character (“~”) or a question mark
      (“?”), it will be treated as a search pattern and all matching versions
      will be displayed (see the section “Search Patterns” in the aptitude
      reference manual). This means that, for instance, aptitude versions '~i'
      will display all the versions that are currently installed on the system
      and nothing else, not even other versions of the same packages.

      $ aptitude versions '~nexim4-daemon-light'
      Package exim4-daemon-light:
      i   4.71-
      3                                                                100
      p   4.71-4                                       unstable
      500

      Package exim4-daemon-light-dbg:
      p   4.71-4                                       unstable
      500

      If the input is a search pattern, or if more than one package's versions
      are to be displayed, aptitude will automatically group the output by
      package, as shown above. You can disable this via --group-by=none, in
      which case aptitude will display a single list of all the versions that
      were found and automatically include the package name in each output line:

      $ aptitude versions --group-by=none '~nexim4-daemon-light'
      i   exim4-daemon-light 4.71-
      3                                             100
      p   exim4-daemon-light 4.71-4                    unstable
      500
      p   exim4-daemon-light-dbg 4.71-4                unstable
      500

      To disable the package name, pass --show-package-names=never:

      $ aptitude versions --show-package-names=never --group-by=none '~nexim4-
      daemon-light'
      i   4.71-
      3                                                                100
      p   4.71-4                                       unstable
      500
      p   4.71-4                                       unstable
      500

      In addition to the above options, the information printed for each version
      can be controlled by the command-line option -F. The order in which
      versions are displayed can be controlled by the command-line option --
      sort. To prevent aptitude from formatting the output into columns, use --
      disable-columns.


  add-user-tag, remove-user-tag
      Adds a user tag to or removes a user tag from the selected group of
      packages. If a package name contains a tilde (“~”) or question mark (“?”),
      it is treated as a search pattern and the tag is added to or removed from
      all the packages that match the pattern (see the section “Search Patterns”
      in the aptitude reference manual).

      User tags are arbitrary strings associated with a package. They can be
      used with the ?user-tag(tag) search term, which will select all the
      packages that have a user tag matching tag.


  why, why-not
      Explains the reason that a particular package should or cannot be
      installed on the system.

      This command searches for packages that require or conflict with the given
      package. It displays a sequence of dependencies leading to the target
      package, along with a note indicating the installed state of each package
      in the dependency chain:

      $ aptitude why kdepim
      i   nautilus-data Recommends nautilus
      i A nautilus      Recommends desktop-base (>= 0.2)
      i A desktop-base  Suggests   gnome | kde | xfce4 | wmaker
      p   kde           Depends    kdepim (>= 4:3.4.3)

      The command why finds a dependency chain that installs the package named
      on the command line, as above. Note that the dependency that aptitude
      produced in this case is only a suggestion. This is because no package
      currently installed on this computer depends on or recommends the kdepim
      package; if a stronger dependency were available, aptitude would have
      displayed it.

      In contrast, why-not finds a dependency chain leading to a conflict with
      the target package:

      $ aptitude why-not textopo
      i   ocaml-core          Depends   ocamlweb
      i A ocamlweb            Depends   tetex-extra | texlive-latex-extra
      i A texlive-latex-extra Conflicts textopo

      If one or more patterns are present (in addition to the mandatory last
      argument, which should be a valid package name), then aptitude will begin
      its search at these patterns. That is, the first package in the chain it
      prints to explain why package is or is not installed, will be a package
      matching the pattern in question. The patterns are considered to be
      package names unless they contain a tilde character (“~”) or a question
      mark (“?”), in which case they are treated as search patterns (see the
      section “Search Patterns” in the aptitude reference manual).

      If no patterns are present, then aptitude will search for dependency
      chains beginning at manually installed packages. This effectively shows
      the packages that have caused or would cause a given package to be
      installed.


      IMG.alt.suffix Note
        = \[Note]]
                     aptitude why does not perform full dependency resolution; it only displays
                     direct relationships between packages. For instance, if A requires B, C
                     requires D, and B and C conflict, “aptitude why-not D” will not produce the
                     answer “A depends on B, B conflicts with C, and D depends on C”.


      By default aptitude outputs only the “most installed, strongest, tightest,
      shortest” dependency chain. That is, it looks for a chain that only
      contains packages which are installed or will be installed; it looks for
      the strongest possible dependencies under that restriction; it looks for
      chains that avoid ORed dependencies and Provides; and it looks for the
      shortest dependency chain meeting those criteria. These rules are
      progressively weakened until a match is found.

      If the verbosity level is 1 or more, then all the explanations aptitude
      can find will be displayed, in inverse order of relevance. If the
      verbosity level is 2 or more, a truly excessive amount of debugging
      information will be printed to standard output.

      This command returns 0 if successful, 1 if no explanation could be
      constructed, and -1 if an error occurred.


  clean
      Removes all previously downloaded .deb files from the package cache
      directory (usually /var/cache/apt/archives).


  autoclean
      Removes any cached packages which can no longer be downloaded. This allows
      you to prevent a cache from growing out of control over time without
      completely emptying it.


  changelog
      Downloads and displays the Debian changelog for each of the given source
      or binary packages.

      By default, the changelog for the version which would be installed with
      “aptitude install” is downloaded. You can select a particular version of a
      package by appending =version to the package name; you can select the
      version from a particular archive or release by appending /archive or /
      release to the package name (for instance, /unstable or /sid).


  download
      Downloads the .deb file for the given package to the current directory.

      This is a thin wrapper over apt(8).


  extract-cache-subset
      Copy the apt configuration directory (/etc/apt) and a subset of the
      package database to the specified directory. If no packages are listed,
      the entire package database is copied; otherwise only the entries
      corresponding to the named packages are copied. Each package name may be a
      search pattern, and all the packages matching that pattern will be
      selected (see the section “Search Patterns” in the aptitude reference
      manual). Any existing package database files in the output directory will
      be overwritten.

      Dependencies in binary package stanzas will be rewritten to remove
      references to packages not in the selected set.


  help
      Displays a brief summary of the available commands and options.



Options

The following options may be used to modify the behavior of the actions
described above. Note that while all options will be accepted for all commands,
some options don't apply to particular commands and will be ignored by those
commands.



  --add-user-tag tag
      For full-upgrade, safe-upgrade, forbid-version, hold, install, keep-all,
      markauto, unmarkauto, purge, reinstall, remove, unhold, and unmarkauto:
      add the user tag tag to all packages that are installed, removed, or
      upgraded by this command as if with the add-user-tag command.


  --add-user-tag-to tag,pattern
      For full-upgrade, safe-upgrade, forbid-version, hold, install, keep-all,
      markauto, unmarkauto, purge, reinstall, remove, unhold, and unmarkauto:
      add the user tag tag to all packages that match pattern as if with the
      add-user-tag command. The pattern is a search pattern as described in the
      section “Search Patterns” in the aptitude reference manual.

      For instance, aptitude safe-upgrade --add-user-tag-to "new-
      installs,?action(install)" will add the tag new-installs to all the
      packages installed by the safe-upgrade command.


  --allow-new-upgrades
      When the safe resolver is being used (i.e., --safe-resolver was passed,
      the action is safe-upgrade, or Aptitude::Always-Use-Safe-Resolver is set
      to true), allow the dependency resolver to install upgrades for packages
      regardless of the value of Aptitude::Safe-Resolver::No-New-Upgrades.


  --allow-new-installs
      Allow the safe-upgrade command to install new packages; when the safe
      resolver is being used (i.e., --safe-resolver was passed, the action is
      safe-upgrade, or Aptitude::Always-Use-Safe-Resolver is set to true), allow
      the dependency resolver to install new packages. This option takes effect
      regardless of the value of Aptitude::Safe-Resolver::No-New-Installs.


  --allow-untrusted
      Install packages from untrusted sources without prompting. You should only
      use this if you know what you are doing, as it could easily compromise
      your system's security.


  --disable-columns
      This option causes aptitude search and aptitude versions to output their
      results without any special formatting. In particular: normally aptitude
      will add whitespace or truncate search results in an attempt to fit its
      results into vertical “columns”. With this flag, each line will be formed
      by replacing any format escapes in the format string with the
      corresponding text; column widths will be ignored.

      For instance, the first few lines of output from “aptitude search -F '%p
      %V' --disable-columns libedataserver” might be:

      disksearch 1.2.1-3
      hp-search-mac 0.1.3
      libbsearch-ruby 1.5-5
      libbsearch-ruby1.8 1.5-5
      libclass-dbi-abstractsearch-perl 0.07-2
      libdbix-fulltextsearch-perl 0.73-10

      As in the above example, --disable-columns is often useful in combination
      with a custom display format set using the command-line option -F.

      This corresponds to the configuration option Aptitude::CmdLine::Disable-
      Columns.


  -D, --show-deps
      For commands that will install or remove packages (install, full-upgrade,
      etc), show brief explanations of automatic installations and removals.

      This corresponds to the configuration option Aptitude::CmdLine::Show-Deps.


  -d, --download-only
      Download packages to the package cache as necessary, but do not install or
      remove anything. By default, the package cache is stored in /var/cache/
      apt/archives.

      This corresponds to the configuration option Aptitude::CmdLine::Download-
      Only.


   -F format, --display-format format
      Specify the format which should be used to display output from the search
      and versions commands. For instance, passing “%p %v %V” for format will
      display a package's name, followed by its currently installed version and
      its candidate version (see the section “Customizing how packages are
      displayed” in the aptitude reference manual for more information).

      The command-line option --disable-columns is often useful in combination
      with -F.

      For search, this corresponds to the configuration option Aptitude::
      CmdLine::Package-Display-Format; for versions, this corresponds to the
      configuration option Aptitude::CmdLine::Version-Display-Format.


  -f
      Try hard to fix the dependencies of broken packages, even if it means
      ignoring the actions requested on the command line.

      This corresponds to the configuration item Aptitude::CmdLine::Fix-Broken.


  --full-resolver
      When package dependency problems are encountered, use the default “full”
      resolver to solve them. Unlike the “safe” resolver activated by --safe-
      resolver, the full resolver will happily remove packages to fulfill
      dependencies. It can resolve more situations than the safe algorithm, but
      its solutions are more likely to be undesirable.

      This option can be used to force the use of the full resolver even when
      Aptitude::Always-Use-Safe-Resolver is true.


   --group-by grouping-mode
      Control how the versions command groups its output. The following values
      are recognized:


      * archive to group packages by the archive they occur in (“stable”,
        “unstable”, etc). If a package occurs in several archives, it will be
        displayed in each of them.

      * auto to group versions by their package unless there is exactly one
        argument and it is not a search pattern.

      * none to display all the versions in a single list without any grouping.

      * package to group versions by their package.

      * source-package to group versions by their source package.

      * source-version to group versions by their source package and source
        version.


      This corresponds to the configuration option Aptitude::CmdLine::Versions-
      Group-By.


  -h, --help
      Display a brief help message. Identical to the help action.


   --log-file=file
      If file is a nonempty string, log messages will be written to it, except
      that if file is “-”, the messages will be written to standard output
      instead. If this option appears multiple times, the last occurrence is the
      one that will take effect.

      This does not affect the log of installations that aptitude has performed
      (/var/log/aptitude); the log messages written using this configuration
      include internal program events, errors, and debugging messages. See the
      command-line option --log-level to get more control over what gets logged.

      This corresponds to the configuration option Aptitude::Logging::File.


   --log-level=level, --log-level=category:level
      --log-level=level causes aptitude to only log messages whose level is
      level or higher. For instance, setting the log level to error will cause
      only messages at the log levels error and fatal to be displayed; all
      others will be hidden. Valid log levels (in descending order) are off,
      fatal, error, warn, info, debug, and trace. The default log level is warn.

      --log-level=category:level causes messages in category to only be logged
      if their level is level or higher.

      --log-level may appear multiple times on the command line; the most
      specific setting is the one that takes effect, so if you pass --log-
      level=aptitude.resolver:fatal and --log-
      level=aptitude.resolver.hints.match:trace, then messages in
      aptitude.resolver.hints.parse will only be printed if their level is
      fatal, but all messages in aptitude.resolver.hints.match will be printed.
      If you set the level of the same category two or more times, the last
      setting is the one that will take effect.

      This does not affect the log of installations that aptitude has performed
      (/var/log/aptitude); the log messages written using this configuration
      include internal program events, errors, and debugging messages. See the
      command-line option --log-file to change where log messages go.

      This corresponds to the configuration group Aptitude::Logging::Levels.


   --log-resolver
      Set some standard log levels related to the resolver, to produce logging
      output suitable for processing with automated tools. This is equivalent to
      the command-line options --log-level=aptitude.resolver.search:trace --log-
      level=aptitude.resolver.search.tiers:info.


   --no-new-installs
      Prevent safe-upgrade from installing any new packages; when the safe
      resolver is being used (i.e., --safe-resolver was passed or Aptitude::
      Always-Use-Safe-Resolver is set to true), forbid the dependency resolver
      from installing new packages. This option takes effect regardless of the
      value of Aptitude::Safe-Resolver::No-New-Installs.

      This mimics the historical behavior of apt-get upgrade.


  --no-new-upgrades
      When the safe resolver is being used (i.e., --safe-resolver was passed or
      Aptitude::Always-Use-Safe-Resolver is set to true), forbid the dependency
      resolver from installing upgrades for packages regardless of the value of
      Aptitude::Safe-Resolver::No-New-Upgrades.


  --no-show-resolver-actions
      Do not display the actions performed by the “safe” resolver, overriding
      any configuration option or earlier --show-resolver-actions.


  -O order, --sort order
      Specify the order in which output from the search and versions commands
      should be displayed. For instance, passing “installsize” for order will
      list packages in order according to their size when installed (see the
      section “Customizing how packages are sorted” in the aptitude reference
      manual for more information).

      Prepending the order keyword with a tilde character (~) reverses the order
      from ascending to descending.

      The default sort order is name,version.


  -o key=value
      Set a configuration file option directly; for instance, use -o Aptitude::
      Log=/tmp/my-log to log aptitude's actions to /tmp/my-log. For more
      information on configuration file options, see the section “Configuration
      file reference” in the aptitude reference manual.


  -P, --prompt
      Always display a prompt before downloading, installing or removing
      packages, even when no actions other than those explicitly requested will
      be performed.

      This corresponds to the configuration option Aptitude::CmdLine::Always-
      Prompt.


  --purge-unused
      If Aptitude::Delete-Unused is set to “true” (its default), then in
      addition to removing each package that is no longer required by any
      installed package, aptitude will also purge them, removing their
      configuration files and perhaps other important data. For more information
      about which packages are considered to be “unused”, see the section
      “Managing Automatically Installed Packages” in the aptitude reference
      manual. THIS OPTION CAN CAUSE DATA LOSS! DO NOT USE IT UNLESS YOU KNOW
      WHAT YOU ARE DOING!

      This corresponds to the configuration option Aptitude::Purge-Unused.


  -q[=n], --quiet[=n]
      Suppress all incremental progress indicators, thus making the output
      loggable. This may be supplied multiple times to make the program quieter,
      but unlike apt-get, aptitude does not enable -y when -q is supplied more
      than once.

      The optional =n may be used to directly set the amount of quietness (for
      instance, to override a setting in /etc/apt/apt.conf); it causes the
      program to behave as if -q had been passed exactly n times.


  -R, --without-recommends
      Do not treat recommendations as dependencies when installing new packages
      (this overrides settings in /etc/apt/apt.conf and ~/.aptitude/config).
      Packages previously installed due to recommendations will not be removed.

      This corresponds to the pair of configuration options APT::Install-
      Recommends and APT::AutoRemove::RecommendsImportant.


  -r, --with-recommends
      Treat recommendations as dependencies when installing new packages (this
      overrides settings in /etc/apt/apt.conf and ~/.aptitude/config).

      This corresponds to the configuration option APT::Install-Recommends


  --remove-user-tag tag
      For full-upgrade, safe-upgrade forbid-version, hold, install, keep-all,
      markauto, unmarkauto, purge, reinstall, remove, unhold, and unmarkauto:
      remove the user tag tag from all packages that are installed, removed, or
      upgraded by this command as if with the add-user-tag command.


  --remove-user-tag-from tag,pattern
      For full-upgrade, safe-upgrade forbid-version, hold, install, keep-all,
      markauto, unmarkauto, purge, reinstall, remove, unhold, and unmarkauto:
      remove the user tag tag from all packages that match pattern as if with
      the remove-user-tag command. The pattern is a search pattern as described
      in the section “Search Patterns” in the aptitude reference manual.

      For instance, aptitude safe-upgrade --remove-user-tag-from "not-
      upgraded,?action(upgrade)" will remove the not-upgraded tag from all
      packages that the safe-upgrade command is able to upgrade.


  -s, --simulate
      In command-line mode, print the actions that would normally be performed,
      but don't actually perform them. This does not require root privileges. In
      the visual interface, always open the cache in read-only mode regardless
      of whether you are root.

      This corresponds to the configuration option Aptitude::Simulate.


  --safe-resolver
      When package dependency problems are encountered, use a “safe” algorithm
      to solve them. This resolver attempts to preserve as many of your choices
      as possible; it will never remove a package or install a version of a
      package other than the package's default candidate version. It is the same
      algorithm used in safe-upgrade; indeed, aptitude --safe-resolver full-
      upgrade is equivalent to aptitude safe-upgrade. Because safe-upgrade
      always uses the safe resolver, it does not accept the --safe-resolver
      flag.

      This option is equivalent to setting the configuration variable Aptitude::
      Always-Use-Safe-Resolver to true.


  --schedule-only
      For commands that modify package states, schedule operations to be
      performed in the future, but don't perform them. You can execute scheduled
      actions by running aptitude install with no arguments. This is equivalent
      to making the corresponding selections in visual mode, then exiting the
      program normally.

      For instance, aptitude --schedule-only install evolution will schedule the
      evolution package for later installation.


  --show-package-names when
      Controls when the versions command shows package names. The following
      settings are allowed:


      * always: display package names every time that aptitude versions runs.

      * auto: display package names when aptitude versions runs if the output is
        not grouped by package, and either there is a pattern-matching argument
        or there is more than one argument.

      * never: never display package names in the output of aptitude versions.


      This option corresponds to the configuration item Aptitude::CmdLine::
      Versions-Show-Package-Names.


  --show-resolver-actions
      Display the actions performed by the “safe” resolver and by safe-upgrade.

      When executing the command safe-upgrade or when the option --safe-resolver
      is present, aptitude will display a summary of the actions performed by
      the resolver before printing the installation preview. This is equivalent
      to the configuration option Aptitude::Safe-Resolver::Show-Resolver-
      Actions.


  --show-summary[=MODE]
      Changes the behavior of “aptitude why” to summarize each dependency chain
      that it outputs, rather than displaying it in long form. If this option is
      present and MODE is not “no-summary”, chains that contain Suggests
      dependencies will not be displayed: combine --show-summary with -v to see
      a summary of all the reasons for the target package to be installed.

      MODE can be any one of the following:


        1. no-summary: don't show a summary (the default behavior if --show-
           summary is not present).

        2. first-package: display the first package in each chain. This is the
           default value of MODE if it is not present.

        3. first-package-and-type: display the first package in each chain,
           along with the strength of the weakest dependency in the chain.

        4. all-packages: briefly display each chain of dependencies leading to
           the target package.

        5. all-packages-with-dep-versions: briefly display each chain of
           dependencies leading to the target package, including the target
           version of each dependency.


      This option corresponds to the configuration item Aptitude::CmdLine::Show-
      Summary; if --show-summary is present on the command-line, it will
      override Aptitude::CmdLine::Show-Summary.

      Example 12. Usage of --show-summary

      --show-summary used with -v to display all the reasons a package is
      installed:

      $ aptitude -v --show-summary why foomatic-db
      Packages requiring foomatic-db:
        cupsys-driver-gutenprint
        foomatic-db-engine
        foomatic-db-gutenprint
        foomatic-db-hpijs
        foomatic-filters-ppds
        foomatic-gui
        kde
        printconf
        wine

      $ aptitude -v --show-summary=first-package-and-type why foomatic-db
      Packages requiring foomatic-db:
        [Depends] cupsys-driver-gutenprint
        [Depends] foomatic-db-engine
        [Depends] foomatic-db-gutenprint
        [Depends] foomatic-db-hpijs
        [Depends] foomatic-filters-ppds
        [Depends] foomatic-gui
        [Depends] kde
        [Depends] printconf
        [Depends] wine

      $ aptitude -v --show-summary=all-packages why foomatic-db
      Packages requiring foomatic-db:
        cupsys-driver-gutenprint D: cups-driver-gutenprint D: cups R: foomatic-
      filters R: foomatic-db-engine D: foomatic-db
        foomatic-filters-ppds D: foomatic-filters R: foomatic-db-engine D:
      foomatic-db
        kde D: kdeadmin R: system-config-printer-kde D: system-config-printer R:
      hal-cups-utils D: cups R: foomatic-filters R: foomatic-db-engine D:
      foomatic-db
        wine D: libwine-print D: cups-bsd R: cups R: foomatic-filters R:
      foomatic-db-engine D: foomatic-db
        foomatic-db-engine D: foomatic-db
        foomatic-db-gutenprint D: foomatic-db
        foomatic-db-hpijs D: foomatic-db
        foomatic-gui D: python-foomatic D: foomatic-db-engine D: foomatic-db
        printconf D: foomatic-db

      $ aptitude -v --show-summary=all-packages-with-dep-versions why foomatic-
      db
      Packages requiring foomatic-db:
        cupsys-driver-gutenprint D: cups-driver-gutenprint (>= 5.0.2-4) D: cups
      (>= 1.3.0) R: foomatic-filters (>= 4.0) R: foomatic-db-engine (>= 4.0) D:
      foomatic-db (>= 20090301)
        foomatic-filters-ppds D: foomatic-filters R: foomatic-db-engine (>= 4.0)
      D: foomatic-db (>= 20090301)
        kde D: kdeadmin (>= 4:3.5.5) R: system-config-printer-kde (>= 4:4.2.2-1)
      D: system-config-printer (>= 1.0.0) R: hal-cups-utils D: cups R: foomatic-
      filters (>= 4.0) R: foomatic-db-engine (>= 4.0) D: foomatic-db (>=
      20090301)
        wine D: libwine-print (= 1.1.15-1) D: cups-bsd R: cups R: foomatic-
      filters (>= 4.0) R: foomatic-db-engine (>= 4.0) D: foomatic-db (>=
      20090301)
        foomatic-db-engine D: foomatic-db
        foomatic-db-gutenprint D: foomatic-db
        foomatic-db-hpijs D: foomatic-db
        foomatic-gui D: python-foomatic (>= 0.7.9.2) D: foomatic-db-engine D:
      foomatic-db (>= 20090301)
        printconf D: foomatic-db
      	

      --show-summary used to list a chain on one line:

      $ aptitude --show-summary=all-packages why aptitude-gtk libglib2.0-data
      Packages requiring libglib2.0-data:
        aptitude-gtk D: libglib2.0-0 R: libglib2.0-data



  -t release, --target-release release
      Set the release from which packages should be installed. For instance,
      “aptitude -t experimental ...” will install packages from the experimental
      distribution unless you specify otherwise.

      This will affect the default candidate version of packages according to
      the rules described in apt_preferences(5).

      This corresponds to the configuration item APT::Default-Release.


  -V, --show-versions
      Show which versions of packages will be installed.

      This corresponds to the configuration option Aptitude::CmdLine::Show-
      Versions.


  -v, --verbose
      Causes some commands (for instance, show) to display extra information.
      This may be supplied multiple times to get more and more information.

      This corresponds to the configuration option Aptitude::CmdLine::Verbose.


  --version
      Display the version of aptitude and some information about how it was
      compiled.


  --visual-preview
      When installing or removing packages from the command line, instead of
      displaying the usual prompt, start up the visual interface and display its
      preview screen.


  -W, --show-why
      In the preview displayed before packages are installed or removed, show
      which manually installed package requires each automatically installed
      package. For instance:

      $ aptitude --show-why install mediawiki
      ...
      The following NEW packages will be installed:
        libapache2-mod-php5{a} (for mediawiki)  mediawiki  php5{a} (for
      mediawiki)
        php5-cli{a} (for mediawiki)  php5-common{a} (for mediawiki)
        php5-mysql{a} (for mediawiki)

      When combined with -v or a non-zero value for Aptitude::CmdLine::Verbose,
      this displays the entire chain of dependencies that lead each package to
      be installed. For instance:

      $ aptitude -v --show-why install libdb4.2-dev
      The following NEW packages will be installed:
        libdb4.2{a} (libdb4.2-dev D: libdb4.2)  libdb4.2-dev
      The following packages will be REMOVED:
        libdb4.4-dev{a} (libdb4.2-dev C: libdb-dev P<- libdb-dev)

      This option will also describe why packages are being removed, as shown
      above. In this example, libdb4.2-dev conflicts with libdb-dev, which is
      provided by libdb-dev.

      This argument corresponds to the configuration option Aptitude::CmdLine::
      Show-Why and displays the same information that is computed by aptitude
      why and aptitude why-not.


  -w width, --width width
      Specify the display width which should be used for output from the search
      and versions commands (in the command line).

      By default and when the output is seen directly in a terminal, the
      terminal width is used. When the output is redirected or piped, a very
      large "unlimited" line width is used, and this option is ignored.

      This corresponds to the configuration option Aptitude::CmdLine::Package-
      Display-Width


  -y, --assume-yes
      When a yes/no prompt would be presented, assume that the user entered
      “yes”. In particular, suppresses the prompt that appears when installing,
      upgrading, or removing packages. Prompts for “dangerous” actions, such as
      removing essential packages, will still be displayed. This option
      overrides -P.

      This corresponds to the configuration option Aptitude::CmdLine::Assume-
      Yes.


  -Z
      Show how much disk space will be used or freed by the individual packages
      being installed, upgraded, or removed.

      This corresponds to the configuration option Aptitude::CmdLine::Show-Size-
      Changes.


The following options apply to the visual mode of the program, but are primarily
for internal use; you generally won't need to use them yourself.



  --autoclean-on-startup
      Deletes old downloaded files when the program starts (equivalent to
      starting the program and immediately selecting Actions  Clean obsolete
      files). You cannot use this option and “--clean-on-startup”, “-i”, or “-u”
      at the same time.


  --clean-on-startup
      Cleans the package cache when the program starts (equivalent to starting
      the program and immediately selecting Actions  Clean package cache). You
      cannot use this option and “--autoclean-on-startup”, “-i”, or “-u” at the
      same time.


  -i
      Displays a download preview when the program starts (equivalent to
      starting the program and immediately pressing “g”). You cannot use this
      option and “--autoclean-on-startup”, “--clean-on-startup”, or “-u” at the
      same time.


  -S fname
      Loads the extended state information from fname instead of the standard
      state file.


  -u
      Begins updating the package lists as soon as the program starts. You
      cannot use this option and “--autoclean-on-startup”, “--clean-on-startup”,
      or “-i” at the same time.



Environment



  HOME
      If $HOME/.aptitude exists, aptitude will store its configuration file in
      $HOME/.aptitude/config. Otherwise, it will look up the current user's home
      directory using getpwuid(2) and place its configuration file there.


  PAGER
      If this environment variable is set, aptitude will use it to display
      changelogs when “aptitude changelog” is invoked. If not set, it defaults
      to more.


  TMP
      If TMPDIR is unset, aptitude will store its temporary files in TMP if that
      variable is set. Otherwise, it will store them in /tmp.


  TMPDIR
      aptitude will store its temporary files in the directory indicated by this
      environment variable. If TMPDIR is not set, then TMP will be used; if TMP
      is also unset, then aptitude will use /tmp.



Files



  /var/lib/aptitude/pkgstates
      The file in which stored package states and some package flags are stored.




  /etc/apt/apt.conf, /etc/apt/apt.conf.d/*, ~/.aptitude/config
      The configuration files for aptitude. ~/.aptitude/config overrides /etc/
      apt/apt.conf. See apt.conf(5) for documentation of the format and contents
      of these files.



See also

apt-get(8), apt(8), /usr/share/doc/aptitude/html/lang/index.html from the
package aptitude-doc-lang

--------------------------------------------------------------------------------

Name

aptitude-create-state-bundle  bundle the current aptitude state


Synopsis

aptitude-create-state-bundle [options...] output-file


Description


IMG.alt.suffix = \[Note]] Note

                          This command is mostly for internal use and bug
                          reporting in exceptional cases, it is not intended for
                          end-users under normal circumstances.


aptitude-create-state-bundle produces a compressed archive storing the files
that are required to replicate the current package archive state. The following
files and directories are included in the bundle:


* $HOME/.aptitude

* /var/lib/aptitude

* /var/lib/apt

* /var/cache/apt/*.bin

* /etc/apt

* /var/lib/dpkg/status


The output of this program can be used as an argument to aptitude-run-state-
bundle(1).


Options



  --force-bzip2
      Override the autodetection of which compression algorithm to use. By
      default, aptitude-create-state-bundle uses bzip2(1) if it is available,
      and gzip(1) otherwise. Passing this option forces the use of bzip2 even if
      it doesn't appear to be available.


  --force-gzip
      Override the autodetection of which compression algorithm to use. By
      default, aptitude-create-state-bundle uses bzip2(1) if it is available,
      and gzip(1) otherwise. Passing this option forces the use of gzip even if
      bzip2 is available.


  --help
      Print a brief usage message, then exit.


  --print-inputs
      Instead of creating a bundle, display a list of the files and directories
      that the program would include if it generated a bundle.



File format

The bundle file is simply a tar(1) file compressed with bzip2(1) or gzip(1),
with each of the input directory trees rooted at “.”.


See also

aptitude-run-state-bundle(1), aptitude(8), apt(8)

--------------------------------------------------------------------------------

Name

aptitude-run-state-bundle  unpack an aptitude state bundle and invoke aptitude
on it


Synopsis

aptitude-run-state-bundle [options...] input-file [ program [arguments...]]


Description


IMG.alt.suffix = \[Note]] Note

                          This command is mostly for internal use and bug
                          reporting in exceptional cases, it is not intended for
                          end-users under normal circumstances.


aptitude-run-state-bundle unpacks the given aptitude state bundle created by
aptitude-create-state-bundle(1) to a temporary directory, invokes program on it
with the supplied arguments, and removes the temporary directory afterwards. If
program is not supplied, it defaults to aptitude(8).


Options

The following options may occur on the command-line before the input file.
Options following the input file are presumed to be arguments to aptitude.



  --append-args
      Place the options that give the location of the state bundle at the end of
      the command line when invoking program, rather than at the beginning (the
      default is to place options at the beginning).


  --help
      Display a brief usage summary.


  --prepend-args
      Place the options that give the location of the state bundle at the
      beginning of the command line when invoking program, overriding any
      previous --append-args (the default is to place options at the beginning).


  --no-clean
      Do not remove the unpacked state directory after running aptitude. You
      might want to use this if, for instance, you are debugging a problem that
      appears when aptitude's state file is modified. When aptitude finishes
      running, the name of the state directory will be printed so that you can
      access it in the future.

      This option is enabled automatically by --statedir.


  --really-clean
      Delete the state directory after running aptitude, even if --no-clean or -
      -statedir was supplied.


  --statedir
      Instead of treating the input file as a state bundle, treat it as an
      unpacked state bundle. For instance, you can use this to access the state
      directory that was created by a prior run with --no-clean.


  --unpack
      Unpack the input file to a temporary directory, but don't actually run
      aptitude.



See also

aptitude-create-state-bundle(1), aptitude(8), apt(8)