/ Mail: 0 / Tue Nov 12 14:39 /
~ $ cat concat.pl

$st1    = "12";
$st2    = "08";
$result = $st1 . $st2;
print "\n", $result, "\n\n";

/ Mail: 0 / Tue Nov 12 14:39 /
~ $ perl concat.pl

1208

/ Mail: 0 / Tue Nov 12 14:39 /
~ $