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Message-ID: | <42DD2E12.458D22A1@dessent.net> |
Date: | Tue, 19 Jul 2005 09:45:06 -0700 |
From: | Brian Dessent <brian AT dessent DOT net> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: OT: grep for \x00 = NUL |
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fergus wrote: > grep $'\x0d' # e.g. equivalent to grep "^M" Using that method you're passing the literal character to grep through a bash quoting mechanism. You can't pass a literal NULL as part of a command line because argv[] consists of NULL-delimited strings, as do most C string functions. Why not just tell grep to look for a NULL rather than trying to feed it an actual literal NULL character? $ grep -P '\000' In pcre regexps you can use \nnn to match any character represented by octal nnn. This would work for any character, and it doesn't rely on a bash-specific shell feature. But it does rely on grep supporting -P for pcre, which is not universal. If that cannot be relied on then you can use $ perl -ne 'print if m/\000/' or $ awk '/\000/ { print }' Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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