how to check my perl installed modules

#perldoc perllocal OR
#ppm install ExtUtils::Installed save and run this one
#source http://www.cpan.org/misc/cpan-faq.html#How_installed_modules


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