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

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Package: grep;

Reported by: Jeff Chua <jeff.chua.linux <at> gmail.com>

Date: Sat, 27 Jul 2019 00:15:02 UTC

Severity: normal

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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Message #10 received at 36820-done <at> debbugs.gnu.org (full text, mbox):

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.
This bug report was last modified 5 years and 274 days ago.

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