This file is indexed.

/usr/share/gcal/birthday.rc is in gcal-common 3.6.3-3build1.

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

The actual contents of the file can be viewed below.

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; Nonsense birthday dates --just for example-- for Gcal-2.20 or newer
;
; Here, the birthday dates are reminded 2 days in advance.
;
; Try this resource file by using these Gcal example options
; for a better understanding what's going on:
;
; * gcal -f./birthday.rc -QUxy
; * gcal -f./birthday.rc -QUxy  -Hyes | sort
; * gcal -f./birthday.rc -Qx    -u 1960
; * gcal -f./birthday.rc -Qx    -u %00010101 9999
; * gcal -f./birthday.rc -Qxy   -u %9999
; * gcal -f./birthday.rc -c-Qxy -u .+
;
$b=%1%>7&*B
$t=%2%3 birthday %1[in %>8*d day(s)]%2 of %1
$d=on %1%3%>02*D0@a -%<3#U0@a %2%4->
$e=on %1%3%>02*D0@b -%<3#U0@b %2%4->
;
a=0101
0@a %i1972 $d$b1971 $tIndy
b=a
a=1230
0@a:2 %i1971 $e$b1970 $tIndy
a=0111
0@a-2:3 %i1972 $d$b1971 $tOttokar
a=0228
0@a-2:3 %i1973 $d$b1972 $tCasper
a=0302
0@a-2:3 %i1974 $d$b1973 $tnot me!
a=0501
0@a-2:3 %i1949 $d$b1948 $tAlfred
a=0601
0@a-2:3 %i1939 $d$b1938 $tElvira
a=0612
0@a-2:3 %i1973 $d$b1972 $tSnoopy
a=0713
0@a-2:3 %i1968 $d$b1967 $tAlf
a=0721
0@a-2:3 %i1953 $d$b1952 $tFurby
a=0722
0@a-2:3 %i1953 $d$b1952 $tKermit
a=0804
0@a-2:3 %i1999 $d$b1998 $tLeia
a=0806
0@a-2:3 %i1939 $d$b1938 $tGroby
a=0811
0@a-2:3 %i1962 $d$b1961 $tObi Wan
a=0813
0@a-2:3 %i1975 $d$b1974 $tWorf
a=0921
0@a-2:3 %i1963 $d$b1962 $tme?
a=1105
0@a-2:3 %i1967 $d$b1966 $tGoofy
a=1111
0@a-2:3 %i1969 $d$b1968 $tDenis
a=1224
0@a-2:3 %i1977 $d$b1976 $tTweety
a=1224
0@a-2:3 %i1974 $d$b1973 $tJoshi