GNU bug report logs - #36820
grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3

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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#36820: closed (grep "[[:cntrl:]]" /proc/1/cmdline works on
 2.20 but not 3.3)
Date: Sat, 27 Jul 2019 17:17:03 +0000

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Your message dated Sat, 27 Jul 2019 10:16:00 -0700
with message-id <d9636ab1-2b9d-b378-87d3-d0cf5e4e0808 <at> cs.ucla.edu>
and subject line Re: bug#36820: grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3
has caused the debbugs.gnu.org bug report #36820,
regarding grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3
to be marked as done.

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


-- 
36820: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36820
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Contact help-debbugs <at> gnu.org with problems

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From: Jeff Chua <jeff.chua.linux <at> gmail.com>
To: bug-grep <at> gnu.org
Subject: grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3
Date: Sat, 27 Jul 2019 07:52:37 +0800

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# using grep 2.20 ...
# grep "[[:cntrl:]]" /proc/1/cmdline
Binary file /proc/1/cmdline matches

# using grep 3.3 or above 2.20 ...
# grep "[[:cntrl:]]" /proc/1/cmdline
... nothing returned



My best.,
Jeff

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Jeff Chua <jeff.chua.linux <at> gmail.com>, 36820-done <at> debbugs.gnu.org
Subject: Re: bug#36820: grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but
 not 3.3
Date: Sat, 27 Jul 2019 10:16:00 -0700

This is documented behavior; the grep manual says that when grep is reading a 
binary file it "may treat non-text bytes as line terminators".

You can use grep's -a (--text) option to if you want to match null bytes.

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