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parent directories of directories

From: Jonas Bernoulli
Subject: parent directories of directories
Date: Mon, 23 Aug 2010 21:48:51 +0200

How does one get the parent directory of a directory in a way that
works on all supported platforms?

For regular files `file-name-directory` can be used but for
directories this just returns the given argument.

One could use `(file-name-directory (substring 0 -1 directory))` but I
have no idea wether this works on all platforms.



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