cat and grep without destroying file

Chris Malton chrism at
Sun Sep 30 14:27:15 UTC 2007

(``-_-´´) -- Fernando wrote:
> I've been trying to make a small shell script that would remove a line from a text file.
> But every time that I pipe the content of grep to the original file, the file ends up blank.
> So, I've made the script use a copy and them replace the original.
> It looks like this:
> #for i in $(/bin/ls -1); do cat $i | egrep -v ^Date > $; mv $ $i; done
> Isn't there any other way, without using the mv?

I don't think so, some how.  I have never successfully done it without 
an mv or a cp.


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