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of length. For instance:
* (Linux) `/a/b/c` returns `['/a/b/c', '/a/b', '/a', '/']`
* (Windows) `C:\a\b\c` returns `['C:\a\b\c', 'C:\a\b', 'C:\a', 'C:']`
:param str path: the path to break into prefixes
:returns: all possible path prefixes of given path in descending order
:rtype: `list` of `str`
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Mitigates https://github.com/certbot/certbot/issues/1833
:param str cmd: the command that is being searched for in the PATH
:returns: True if the operation succeeded, False otherwise
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