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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: dired-move-to-filename-regexp
Date: Tue, 21 Sep 2004 14:30:08 -0400
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    Why not have Emacs try "ls -l --dired" first, and, if that doesn't
    work, fall back on "ls -l" without --dired?

Running ls can take substantial time, so a failing call to ls is
somewhat unpleasant.  If it happens just the first time, it could be
ok.