Shell Programming and Scripting

host16 /etc/passwd changed Thu Jan 3 16:39:48
host3 /etc/group changed Thu Jan 3 16:39:48
host2 /etc/services changed Thu Jan 3 16:39:48
host10 /etc/group changed Thu Jan 10 09:59:01
host11 /etc/group changed Thu Jan 3 18:55:38
host17 /etc/group changed Thu Jan 3 17:45:41
host3 /etc/security/user changed Fri Dec 21 12:25:23
host6 /etc/group changed Thu Dec 27 10:34:27
host7 /etc/security/user changed Thu Dec 27 10:34:27
host8 /etc/passwd changed Thu Dec 27 11:50:40
host5 /etc/passwd changed Thu Dec 27 12:00:57
host1 /etc/passwd changed Thu Dec 27 12:05:58
host3 /etc/passwd changed Thu Dec 27 12:13:29
host4 /etc/passwd changed Thu Dec 27 12:28:13
host3 /etc/passwd changed Thu Dec 27 12:47:29
host2 /etc/security/user changed Tue Jan 8 13:15:02

perl -MDate::Parse -e 'print sort{$a=~/ changed (.*)/;$x=$1;$b=~/ changed (.*)/;$y=$1;str2time($y)<=>str2time($x)}<>' < filename

BEGIN {
  monthList="JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC"
  n=split(monthList, monthA, FS)
  for(i=1; i<=n; i++)
    monthA[monthA[i]]=i
}
{
  t=$NF
  gsub("[^0-9]", "", t)
  printf("%02d%02d%06d %s\n", monthA[toupper($(NF-2))], $(NF-1), t, $0)
}