/usr/lib/pd/extra/slip/slipenc-help.pd is in pd-slip 0.1~svn17542-1.
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 | #N canvas 1 53 855 568 10;
#X obj -98 77 packOSC;
#X msg -98 52 /test 1 2 3 192 218 219 220 221 222;
#X floatatom -72 99 5 0 0 0 - - -;
#X text -99 3 [slipenc]: Encode a list of bytes using Serial Line Internet
Protocol (SLIP);
#X obj -71 246 print encoded;
#X obj -71 163 print original;
#X obj 8 381 print decoded;
#X obj -98 141 t a a;
#X obj -98 224 t a a;
#X msg 124 60 /test/pi 3.14159;
#X msg 233 60 /test/pi \$1;
#X obj 233 40 expr 4*atan(1);
#X obj 233 22 bng 15 250 50 0 empty empty empty 17 7 0 10 -4034 -86277
-1;
#X obj -98 448 unpackOSC;
#X obj -98 364 t a a;
#X obj -98 469 routeOSC /test;
#X obj -92 492 print test;
#X obj -17 492 print other;
#X obj -98 515 routeOSC /pi;
#X floatatom -98 537 12 0 0 0 - - -;
#X text -16 190 Encodes a list of bytes for transmission through a
serial link using SLIP (RFC 1055). Useful for sending OSC through [comport].
;
#X msg -52 124 192 192 192 192 192;
#X obj -104 322 cnv 15 60 30 empty empty empty 20 12 0 14 -4034 -66577
0;
#X obj -103 186 cnv 15 60 30 empty empty empty 20 12 0 14 -4034 -66577
0;
#X msg 27 174 1 2 3 4;
#X text 340 77 The motivation behind SLIP is the need to determine
the boundaries of a packet when it is received one byte at a time \,
as with a serial channel. Bytes are integers between 0 and 255;
#X msg 79 124 1 2 3 4 5 6;
#X msg 160 124 1.1 2.22 3 4 5 6;
#X text -37 98 single floats will pass through as single packets;
#X msg -76 290 verbosity \$1;
#X obj -76 271 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
1;
#X text 340 134 SLIP (RFC 1055) is a simple encoding that prefixes
each packet with 192 \, and replaces 192s inside the packet with 219
followed by 220 Any 219 will be replaced with 219 and 221 The packet
ends with 192;
#X obj -71 383 list split 1;
#X obj -71 404 == 47;
#X obj -98 425 spigot;
#X text -35 403 select OSC messages based on the leading '/';
#X obj -59 358 print valid;
#X text 56 234 Note that the SLIP specification limits the maximum
packet size to 1006...;
#X obj -98 191 slipenc;
#X obj -98 329 slipdec;
#X text 31 530 Author: Martin Peach \, 2010/10/01;
#X text 57 262 ...but a float argument to slipenc will set another
maximum packet size;
#N canvas 529 327 494 344 META 0;
#X text 12 135 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2 or later;
#X text 12 115 AUTHOR Martin Peach;
#X text 12 5 KEYWORDS control conversion;
#X text 12 95 OUTLET_0 anything;
#X text 12 46 DESCRIPTION encode a list of bytes using Serial Line
Internet Protocol (SLIP);
#X text 12 75 INLET_0 float list;
#X restore 693 530 pd META;
#X connect 0 0 7 0;
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#X connect 8 1 4 0;
#X connect 9 0 0 0;
#X connect 10 0 0 0;
#X connect 11 0 10 0;
#X connect 12 0 11 0;
#X connect 13 0 15 0;
#X connect 14 0 34 0;
#X connect 14 1 6 0;
#X connect 14 1 32 0;
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#X connect 21 0 7 0;
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