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(tar.info)Recursive Unlink

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Recursive Unlink
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`--recursive-unlink'
     When this option is specified, try removing files and directory
     hierarchies before extracting over them.  _This is a dangerous
     option!_

   If you specify the `--recursive-unlink' option, `tar' removes
_anything_ that keeps you from extracting a file as far as current
permissions will allow it.  This could include removal of the contents
of a full directory hierarchy.