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     -xdirectory

          tells perl that the script is embedded  in  a  message.
          Leading  garbage will be discarded until the first line
          that starts with #! and  contains  the  string  "perl".
          Any  meaningful  switches  on that line will be applied
          (but only one group of switches, as with normal #! pro-
          cessing).   If a directory name is specified, Perl will
          switch to that directory  before  running  the  script.
          The -x switch only controls the the disposal of leading
          garbage.  The script must be terminated with __END__ if
          there is trailing garbage to be ignored (the script can
          process any or all of the trailing garbage via the DATA
          filehandle if desired).