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S9 LIB (dirname string) ==> string
Return the directory part of the Unix path name in STRING. Note
that DIRNAME performs merely a syntaxical operation without any
regard to the actual file system structure, i.e.
(dirname "/foo/bar") ==> "/foo"
even if "bar" is also a directory. DIRNAME also takes care of
trailing slashes and recognizes some special cases (see examples).
(dirname "/foo/bar/baz") ==> "/foo/bar"
(dirname "foo/bar") ==> "foo"
(dirname "foo/bar/") ==> "foo"
(dirname "/foo") ==> "/"
(dirname "/") ==> "/"
(dirname "foo") ==> "."
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