GNU bug report logs - #41004
Documentation:enhancement - search for hexvalue

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Radisson97 <at> web.de
Subject: bug#41004: closed (Re: bug#41004: Documentation:enhancement -
 search for hexvalue)
Date: Tue, 22 Sep 2020 03:26:02 +0000

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Your bug report

#41004: Documentation:enhancement - search for hexvalue

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 41004 <at> debbugs.gnu.org.

-- 
41004: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=41004
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Jim Meyering <jim <at> meyering.net>, Stephane Chazelas <stephane <at> chazelas.org>
Cc: 41004-done <at> debbugs.gnu.org, Radisson97 <at> web.de
Subject: Re: bug#41004: Documentation:enhancement - search for hexvalue
Date: Mon, 21 Sep 2020 20:25:15 -0700

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I installed the attached doc patch, which I hope addresses the issues mentioned 
in this bug report, and am boldly closing the bug report.

[0001-doc-say-how-to-match-chars-by-code.patch (text/x-patch, attachment)]

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From: Radisson97 <at> web.de
To: bug-grep <at> gnu.org
Subject: Documentation:enhancement - search for hexvalue
Date: Fri, 1 May 2020 19:05:28 +0200

Hi,
i had the problem of searching for a non-printable character in a long
list of strings. I found nothing the documentation and but several discussion
how to do that where either complicated or did not fit for my case, maybe i
was unlucky, ntl i found a simple solution that should be mentioned in the
documentation.

problem: grep for a character where only the hexcode in known.

solution:        use $'\xNN'
                     then shell expands this to the required code

example:       printf "A\nB\nC\n" | grep $'\x41'

note: that uses only printable characters, it works also with anything else
         except \0 (i guess).

i found that solution nice, it did no require any flags etc, for my problem it
worked like a charm.
(i am not member of the list please reply directly to this address) .

hope that helps,
 radisson

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