Read the manpage for Getopt::Long

If you pass GetOptions an array ref for one of the values, it will populate it as such.

So you have to call you program like this: program.pl --thing a --thing b --thing c.

Your script will look something like this:

#!/usr/bin/perl -w

use strict;
use Getopt::Long;

GetOptions(
            'thing=s' => \my @things,
          );

print join("\n", @things), "\n";
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