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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