How do I find what Perl modules are installed on my system?

Assuming you have perldoc installed, simply typing perldoc perllocal will give you a nicely-formatted detailed list of all the installed Perl modules.

For a simpler list that simply prints out the module names and their version numbers, there is another alternative. You must have the ExtUtils::Installed module installed in order to use it. Enter this code into a file and have Perl run it.
use ExtUtils::Installed;
my $instmod = ExtUtils::Installed->new();
foreach my $module ($instmod->modules()) {
my $version = $instmod->version($module) || "???";
@ print “$module — $version\n”;@

See this page from the CPAN FAQ for more details.

The Perl Cookbook contains an example program that will give an extremely thorough listing of each module (and their sub-modules) from every Perl directory you have, called pmdesc. The program can be downloaded for free at: It’s found in Section 12.19. This book is in UCLA’s licensed copy of O’Reilly’s Safari Online so you can read more about it there.