If directory includes more than one pathname
component, remove it, then strip the last component and remove the
resulting directory, etc., until all components have been removed. Thus,
`rmdir -p a/b/c' is equivalent to `rmdir a/b/c; rmdir a/b; rmdir a'.
Normally rmdir will refuse to remove a directory
that is not empty. This option causes rmdir to ignore the failure
to remove a directory, if that failure is due to the directory being
non-empty. (New in fileutils-4.0.)