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: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#41004: closed (Documentation:enhancement - search for hexvalue)
Date: Tue, 22 Sep 2020 03:26:02 +0000

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Your message dated Mon, 21 Sep 2020 20:25:15 -0700
with message-id <8a8edbb9-af9f-b8b3-43c3-1e22b0a54141 <at> cs.ucla.edu>
and subject line Re: bug#41004: Documentation:enhancement - search for hexvalue
has caused the debbugs.gnu.org bug report #41004,
regarding Documentation:enhancement - search for hexvalue
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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41004: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=41004
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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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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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