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Date: Sat, 4 Sep 2004 02:46:33 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: jd <web@3dresearch.com>
Message-ID: <20040903234633.GA25378@gothmog.gr>
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cc: freebsd-questions@freebsd.org
Subject: Re: String replacement with sed
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On 2004-09-03 19:37, jd <web@3dresearch.com> wrote:
>
> I need to change a bunch of Analog config files; among other things
> change the location of IMAGEDIR. I made this simple script:
>
> #!/bin/sh
> for loop in `ls analog/*`
> do
>     sed -e '/IMAGEDIR/s/www2.3dresearch.com\/analog_images\//fiordiligi.3dresearch.com\/images\//p' $loop > $loop.sed
> done
>
> It works fine, except I get duplicate lines, such as:
>
> IMAGEDIR                http://fiordiligi.3dresearch.com/images/
> IMAGEDIR                http://fiordiligi.3dresearch.com/images/

Remove the trailing 'p' from your substitution pattern or use the same
regexp with the -n option of sed, i.e.:

$ echo foo bar | sed -e '/foo/ s/foo/FOO/p'
FOO bar
FOO bar
$ echo foo bar | sed -n -e '/foo/ s/foo/FOO/p'
FOO bar
$ echo foo bar | sed -e '/foo/ s/foo/FOO/'
FOO bar
$