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  1. or download this
    $ perldoc -f rmdir
       rmdir FILENAME
...
               that directory is empty.  If it succeeds it
               returns true, otherwise it returns false and sets
               "$!" (errno).  If FILENAME is omitted, uses "$_".
  2. or download this
    s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)