List installed modules and their versions

installedModules.pl

# This prints out a list of all the installed Perl modules on the system and the version of each one
# that is currently installed

use strict;
use warnings;
use ExtUtils::Installed;

my $instmod = ExtUtils::Installed->new();
foreach my $module ($instmod->modules()) {
my $version = $instmod->version($module) || "???";
       print "$module -- $version\n";
}