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From:	Rugxulo <rugxulo AT gmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: GNU sed question
Date:	Fri, 23 Apr 2010 13:08:44 -0700 (PDT)
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hi,

On Apr 23, 12:05=A0pm, Mike <n DOT  DOT  DOT  AT please DOT dont DOT invalid> wrote:
>
> Why does sed change all the first occurences of AA on each line to ZZ?
> I expect sed to change only the first line:
>
> The sed version is 4.2.1 from delorie.com. The computer is running XP.

Thanks to Eli for helping somebody yet again.   ;-)

For the record, if you want to only change the first line, you have to
tell sed that (e.g. sed -e "1s/AA/ZZ/"), as it by default always runs
over each line (whereas ed/ex/vi don't assume 1,$ address range by
default).

More generic sed help can be found here:

http://www.pement.org/sed/index.htm
http://sed.sourceforge.net/

P.S. I love GNU sed, but in my experience it's pretty darn slow on big
files. Either run from a RAM drive or use GNU ed (which should load
the whole file into RAM instead of parsing one line at a time) if you
need better speed. Honestly, I often use csed (based upon hhsed,
itself based upon Eric Raymond's version) for simpler tasks:

http://lvogel.free.fr/sed.htm

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