Embrace && and || for Control and Values

• Perl's && and || operators short circuit like C's but they return the first thing that resolves them
• This is most often used with ||

      ++$count{ $shell || "/bin/sh" };
      $a = $b || 'DEFAULT';
      $x ||= 'DEFAULT';
  

• Sometimes it can be done with && also, usually providing the false value is '' not 0
• False tests in Perl return '' not 0!

      $nulled_href = $href . ($add_nulls && "\0");