find out whats there and what needs to be added

This is a FAQ (or part of it is, anyway): perlfaq3, "How do I find which modules are installed on my system?"

Nonetheless, it has been asked many times and because TMTOWTDI there are nearly as many different answers. Super Search is your friend. The following results were found using this search:

• Module installed Path
• Management of perl modules in enterprise?
• module management in enterprise?

Here are two example scripts that I found floating around my hard drive. The first uses File::Find to locate installed modules (some may advocate the File::Find::Rule interface instead) and the second uses Module::Info to obtain the version and path information for each module. Once you have that information, you can compare it to your list of dependencies.

Example of File::Find

use strict;
use warnings;

use File::Find;

my $outfile = 'installed_mods.txt';

open( OUTFILE, '>', $outfile ) or die "error opening $outfile: $!\n";

for( @INC )
{
    find( \&modules, $_ );
}

sub modules
{
    if( -d && /^[a-z]/ )
    {
        $File::Find::prune = 1;

        return;
    }

    return unless /\.pm$/;

    my $fullPath = "$File::Find::dir/$_";
    $fullPath =~ s/\.pm$//;
    $fullPath =~ s[/(\w+)$][::$1];

    print OUTFILE "$fullPath\n";
}
[download]

Example of Module::Info

use strict;
use warnings;

use Module::Info;

my @mods = Module::Info->all_installed( 'Bit::Vector' );

foreach my $mod ( @mods )
{
    print join( "\n   ", $mod->name, $mod->version,
                         $mod->inc_dir, $mod->file, $mod->is_core );
}
[download]

Update: Added Super Search results

<caveat>Im a perl noob - and particularly to this board - sorry about hitting a FAQ</caveat> I entered this bit:

#!/usr/bin/perl -w

use ExtUtils::Installed;
my $inst = ExtUtils::Installed->new();
my @modules = $inst->modules();
use Data::Dumper;
print Dumper(@modules);
[download]

Works great - but why isn't 'extutils' in the list? <edit> Found this thread: http://www.perlmonks.org/?node_id=574615 </edit>

http://www.perlmonks.org/?node_id=574615

If you use [id://574615] you'll get a clickable URL, like this ExtUtils::Installed doesn't list all modules. There's lots of other perlmonks markup shortcuts you can use; you can read all about them in What shortcuts can I use for linking to other information?.

Maybe you can create a personal bundle of modules, and then install the Bundle in the rest of machines

To do this, create an empty package with the modules you want listed in the POD "contents" section

package Bundle::Personal::Modules
1;
__END__
=head1 NAME
Bundle::Personal::Modules
=head1 SYNOPSIS
perl -MCPAN -e 'install Bundle::Personal::Modules'
=head1 CONTENTS
#Here your modules...
Data::Dumper
Test::Pod
# etc...
[download]

perl -MCPAN -e 'install Bundle::Personal::Modules'
[download]

citromatik