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Re: Why does not rgrep use "grep -r"?

From: Kim F. Storm
Subject: Re: Why does not rgrep use "grep -r"?
Date: Sun, 04 Nov 2007 01:57:55 +0100
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.1 (gnu/linux)

Miles Bader <address@hidden> writes:

> "Lennart Borgman (gmail)" <address@hidden> writes:
>> If grep can do recursive searches then why not use that in rgrep?
> I don't know the reason of the rgrep authors (though I suspect it was
> portability concerns), 

Yes portability was definitely a concern.

When I first wrote the code years ago, grep -r wasn't widely supported,
so I wrote it to use find, xargs, and grep.

Later when I integrated rgrep into Emacs 22.1, I reworked quite a lot
of the existing grep & find stuff so that the old grep and grep-find, and
the new lgrep and rgrep commands could share a common code base.

Since both grep-find and my rgrep code used find/xargs/grep, I decided
to continue using them, even though grep -r could have been an alternative.

But I was still concerned about portability, and since using find
worked just nicely, I saw no reason to change.  Besides, as you and
others have noted, grep -r has severe performance problems on some

It probably wouldn't be difficult to make it used grep -r (as an
_optional alternative_), but the current code works nicely and is well
tested, so why mess with it?

Kim F. Storm <address@hidden> http://www.cua.dk

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