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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: request for review: Doing direct file I/O in Emacs Lisp
Date: Sun, 16 May 2004 09:20:11 -0400
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    >     What about "ls foo | grep bla"?  Then the output isn't a file.
    >
    > Then you could put the ls output in a buffer and feed it to grep.
    > That would work fine.

    But then, you would have to wait until ls is finished.  It would be
    very useful to be able to see partial results while the command is
    running.

You could feed the output to grep in whatever size chunk you like.