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: Jeff Chua <jeff.chua.linux <at> gmail.com>
Subject: bug#36820: closed (Re: bug#36820: grep "[[:cntrl:]]"
 /proc/1/cmdline works on 2.20 but not 3.3)
Date: Sat, 27 Jul 2019 17:17:04 +0000

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Your bug report

#36820: grep "[[:cntrl:]]" /proc/1/cmdline works on 2.20 but not 3.3

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 36820 <at> debbugs.gnu.org.

-- 
36820: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36820
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: 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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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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