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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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