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ELisp finding files in Path

From: Paulo J. Matos
Subject: ELisp finding files in Path
Date: Tue, 28 Sep 2010 11:10:12 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)


I would like to execute some commands in my .emacs only if there are
some files in the current PATH. The specific example is, I only want to
load a perforce library (p4.el) if I can find the executable p4 in the

How can I do this? I couldn't find any way to either run a shell command
(through which I could run `which p4`), or read an environment variable
PATH, and then find all the files in it and see if p4 is there.

Any tips would be appreciated.


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