Date: Tue, 26 Aug 2008 14:39:03 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-questions@FreeBSD.ORG, walt@wump.org Subject: Re: sed/awk, instead of Perl Message-ID: <200808261239.m7QCd3cp029363@lurza.secnetix.de> In-Reply-To: <p0624080cc4d504c10465@[10.0.0.10]>
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Walt Pawley wrote:
> wump$ time sed "s/ .*//" Desktop/klog > kadr1
Note that this is a job for cut(1):
$ cut -d" " -f1 input
Interestingly, the fastest way to do that job is to use
a regular expression with Python. This is about twice
as fast as the proposed perl solution:
$ python -c 'import re; print re.sub(" .*\n", "\n", file("input").read())'
(Of course, in a script you would write that command in
a more readable way instead of trying to squeeze it all
on a single line.)
Best regards
Oliver
PS: Of course, if you really need the last percent of
speed, then you should write your own specialized tool
in C.
--
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