Date: Fri, 31 May 2002 13:11:47 +0100 From: Ceri Davies <setantae@submonkey.net> To: j mckitrick <jcm@FreeBSD-uk.eu.org> Cc: freebsd-questions@freebsd.org Subject: Re: Why does 'sed' delete my input file? Message-ID: <20020531121147.GA17428@submonkey.net> In-Reply-To: <20020531130029.B28925@dogma.freebsd-uk.eu.org> References: <20020531130029.B28925@dogma.freebsd-uk.eu.org>
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On Fri, May 31, 2002 at 01:00:29PM +0100, j mckitrick wrote: > > This is a simple question, but I can't find the answer. The Daemonnews > article that seems to answer it is missing the graphics with the > screenshots. > > If I want to replace all occurrences of 'foo' in a file, this is what I > tried: > > sed s/foo/bar/g file1 > file1 > > But this deletes (overwrites?) the contents of the file. What did I do > wrong? Do you end up with a zero length file ? I *think* this is because the shell truncates file1 before calling sed, so that all sed has to work with is an empty file. I'm probably wrong though. Ceri -- you can't see when light's so strong you can't see when light is gone To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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