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From: Chong Yidong <cyd@gnu.org>
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Subject: shell-dir-cookie-re in Emacs 24
Date: Sun, 01 Jan 2012 22:57:06 +0800
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Emacs 24 has this in NEWS:

*** New variable `shell-dir-cookie-re'.
If set to an appropriate regexp, Shell mode can track your cwd by
reading it from your prompt.

Could you explain what the purpose of this is?  The docstring says "It
can be used instead of or in addition to `dirtrack-mode'", but what does
it do that dirtrack-mode doesn't already do?