Here's a slightly modified script that worked on my versions of perl from 5.8.8 thru 5.20.0. Note: Always use strictures.

 
#!/usr/bin/perl -l    

use strict;
use warnings;
require LWP::UserAgent;

my $ua = LWP::UserAgent->new;
$ua->agent("Mozilla/8.0");
$ua->cookie_jar(
    {   file => 'mycookies.txt',
        autosave => 1
    }
);

my $url = 'http://www.perlmeme.org/';
my $req = HTTP::Request->new( 'GET', $url );
my $res = $ua->request( $req, undef, undef ) || die( 'Get'->Bad );

if ( $res->is_success ) {
    print $res->decoded_content;
}
else {
    print ">>  ", $res->status_line;
}
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