What's in core varies from one version of perl to another, so unless you also nail down *exactly* what version of perl your application is for, then you may need to be a bit clever about core modules. But only a bit clever, cos it's pretty easy really.

For every module that you depend on, including core modules, check to see if a recent enough version of it is installed. If not, add it to the list of modules that you need to install. Many core modules (at least of those which haven't been in core since forever) are dual-lived so also exist independently on the CPAN.

Your script will end up looking something like this ... 

#!/usr/bin/perl

use strict;
use warnings;
use CPAN;

my %needed = (
  Some::Module => 1.23, # must have at least version 1.23
  Other::Module => 0, # any old version will do
  ...
);
my @need_to_install = ();
foreach my $module (keys %needed) {
  eval "use $module;";
  if($@ || eval "${module}::VERSION < $needed{$module}") {
    push @need_to_install, $module;
    next;
  }
}
CPAN::Shell->install(@need_to_install);

[download]

In reply to Re^2: How to combine multiple perl modules to make them run from command line by DrHyde
in thread How to combine multiple perl modules to make them run from command line by newbie_coder

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.