Assuming that CPAN is configured to use local, this will list all the installed and all the unavailable modules(uses modlist):

#!/usr/bin/perl

BEGIN {
        $| = 1;
}

use strict;
use warnings;
use CPAN;
use Term::ANSIColor::Print;

my $print = Term::ANSIColor::Print->new();

my $d = shift @ARGV;
foreach $d (CPAN::Shell->expand("Module", "/./")) {
$print->bold_black( "\n\tmodule: ", $d->id), 
$print->dark_blue( "\tauthor: ", $d->cpan_userid),
$print->bold_black("\tcurrent version: ", $d->cpan_version),
$print->dark_green( "\tinstalled version: ", $d->inst_version), 
$print->dark_red( "\t", $d->inst_file); 
}
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