From: David Kastrup <dak@gnu.org>
Cc: Le Wang <l26wang@gmail.com>, Emacs-Devel <emacs-devel@gnu.org>
Subject: Re: grep command doc - point out that you can chain now
Date: Mon, 17 Jul 2006 09:26:57 +0200 [thread overview]
Message-ID: <85sll0wv26.fsf@lola.goethe.zz> (raw)
In-Reply-To: <MEEKKIABFKKDFJMPIOEBEEGADDAA.drew.adams@oracle.com> (Drew Adams's message of "Sun, 16 Jul 2006 20:39:07 -0700")
"Drew Adams" <drew.adams@oracle.com> writes:
> I just found out from Le Wang that you can now chain grep commands within
> the Emacs `grep' command. I mean that you can now do `M-x grep foo *.el |
> grep bar | grep toto'.
>
> This is absolutely wonderful. I don't know when it was added (I suspect
> Emacs 22) - it wasn't available in Emacs 20, in any case. (In Emacs 20, I've
> been using `M-!' to chain greps, or doing it outside Emacs. BTW,
> `flush-lines' doesn't work in *grep*, because it throws off the `next-error'
> index.)
>
> Chaining this way, in my experience, represents how most programmers use
> grep. Instead of trying to come up with a complex regexp, they just use two
> or three chained greps. The technique is so useful that I've applied it to
> the use of regexps generally (e.g. regexp searching) in my own libraries.
>
> So, I'm disappointed to see that this is not pointed out in the Emacs manual
> presentation of `grep'. I really think this is worth pointing out
> explicitly, with a simple example, especially since it was not possible
> before.
Why wouldn't it have been possible before?
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
next prev parent reply other threads:[~2006-07-17 7:26 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-17 3:39 grep command doc - point out that you can chain now Drew Adams
2006-07-17 7:26 ` David Kastrup [this message]
2006-07-17 8:19 ` Nick Roberts
2006-07-17 15:28 ` Drew Adams
2006-07-17 17:59 ` Eli Zaretskii
2006-07-17 18:20 ` Drew Adams
2006-07-18 0:12 ` Richard Stallman
2006-07-18 2:30 ` Nick Roberts
2006-07-18 4:22 ` Drew Adams
2006-07-18 5:02 ` Nick Roberts
2006-07-18 5:53 ` Drew Adams
2006-07-18 15:00 ` Richard Stallman
2006-07-18 14:59 ` Richard Stallman
2006-07-18 21:12 ` Nick Roberts
2006-07-19 6:05 ` Richard Stallman
2006-07-19 7:02 ` Nick Roberts
2006-07-19 8:52 ` Drew Adams
2006-07-19 9:05 ` Nick Roberts
2006-07-19 21:15 ` Richard Stallman
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