#!/usr/bin/perl
use warnings;
use strict;

our @ARR1;

use Getopt::Long;

my @list;
BEGIN {
    GetOptions('arrays|a=s' => \ my $arrays);
    my $list = { one  => ['@ARR1'],
                 two  => ['@ARR2'],
                 both => [qw[ @ARR1 @ARR2 ]],
               }->{$arrays};
    @list = @{ $list || [] };
}

use if scalar @list => ('MyVar', @list);

our @ARR2;

print @ARR1, ' ', @ARR2, "\n";