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grep: should report the bad regex

From: Aharon Robbins
Subject: grep: should report the bad regex
Date: Tue, 20 Jul 2004 15:27:00 +0300

Greetings.  Using GNU grep 2.5.1, if you give an invalid regex, all grep
does is tell you that it got a bad regex, but it doesn't print the
regex back at you.  This is not a problem when you enter the grep command
straight at the command line, but is a problem if you build it on the fly
using a shell loop like this:

        while read com
        do if grep -q "<literal>$com</" file.xml
           then echo $com
        done < bigcomlist > smallcomlist


Arnold Robbins

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