Merlyn's solution is better, but the directory already existing is why it checks the error message:

      if ($! !~ /exists/i)
      {
        die "Couldn't mkdir($dirsofar): $!";
      }
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As long as the error message contains the word "exists", it will just ignore the error and continue on. I tested this case, and it worked fine for me. If it doesn't work for you, I'm curious what error message it prints...