#!/usr/bin/perl -w
#<UnusedGrp.pl> Find unused Groups in /etc/group

my $GROUPfile="/etc/group";
my $gfpid = open(GFILE, "<$GROUPfile") or die "$GROUPfile File Not Found: $!\n";
my $PASSWD="/etc/passwd";
my $pfpid = open(PFILE, "<$PASSWD") or die "$PASSWD File Not Found: $!\n";
@PWLINES = <PFILE>;

while (my $line = <GFILE>) {
   @GRP = split(/:/, $line);
   if (length($GRP[3]) < 2){
     print "$GRP[0]:$GRP[2] is zero length\n";
     if ((@GREPED = grep(/\:\*\:${GRP[3]}\:/, @PWLINES))) {
       print @GREPED;
     }
     undef @GREPED;
   }
}