Here is a program that runs on RH Linux 9 that will list all the Perl modules installed on the system:

#!/usr/bin/perl - w
# checkmodule.pl

use strict;

use File::Find;
           my @files;
 
           find sub { push @files, $File::Find::name if -f _ && /\.pm$
+/ },
                @INC;

my ($mod, $hash, $name);
my (@results, %hash, @results2);  
@results =  map {/.+\/.+\/(.*)\.pm$/} @files;
#@results = sort {uc($a) cmp uc($b)} @results;
#@results = map {/.+\/.+\/(.*)\.pm$/ and ucfirst($1)} @files;

$hash{$_}++ foreach (@results);
foreach (sort {uc($a) cmp uc($b)} keys %hash) {
    print "$_.pm \n";
}
#@results2 = grep( ($hash{$_} == 1), keys %hash );
#print join "\n", @results2;
#print "\n";
[download]

BTW, I got the program here on Perl Monks. Someone listed it as part of their answer to a question asked. I wish I could remember where I got it so I could give proper attribution.

xenchu