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  1. or download this
      % extprog >big.data
  % myperl big.data
  2. or download this
      open(CMDREAD, "$program $args |")
    or die "ERROR in executing $program $args: $!\n";
...
    # do something with $_
  }
  close (CMDREAD);
  3. or download this
      $foo = $bar + 1 unless $moon->phase < 0.2;