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  1. or download this
    print File::Spec->rel2abs(
    File::Spec->catdir(
...
        File::Spec->updir(),
    )
);
  2. or download this
    print File::Spec->rel2abs(
    File::Spec->updir,
    dirname(__FILE__)
  );
  3. or download this
    print dirname(dirname(File::Spec->rel2abs(__FILE__)));
  4. or download this
    print dirname(dirname(__FILE__));    # ?? Is this reliable?