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[Bug 1504127] [NEW] grep -q gets broken pipe message with multiple expressions

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From: Launchpad Bug Tracker <1504127@xxxxxxxxxxxxxxxxxx>
Date: Thu, 08 Oct 2015 16:37:31 -0000
Reply-to: Bug 1504127 <1504127@xxxxxxxxxxxxxxxxxx>
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== Comment: #0 - Liang Chang Guo <lcguo@xxxxxxxxxx> - 2015-10-06 20:43:30 ==
For testing if a system is Ubuntu, the following combined command with bash always gets extra BrokenPipeError on Ubuntu (14.04 to 15.10):

# ( cat /etc/os-release /proc/version; lsb_release -is ) | grep -iq Ubuntu 
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe

While the return code is correct:
# ( cat /etc/os-release /proc/version; lsb_release -is ) | grep -iq Ubuntu && echo It-is-Ubuntu
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe
It-is-Ubuntu

It may work well if with slight changes for the command:
# ( cat /etc/os-release /proc/version; lsb_release -is ) | grep -i Ubuntu
NAME="Ubuntu"
... ...
# ( cat /etc/os-release /proc/version; lsb_release -is ) | grep -iq UbuntuW
# ( cat /etc/os-release /proc/version; sleep 1; echo =; lsb_release -is ) | grep -iq Ubuntu
# cat /etc/os-release /proc/version | grep -iq Ubuntu
# (lsb_release -is) | grep -iq Ubuntu

*** Ubuntu Platform Info ***
# uname -a
Linux ubt1510J2 4.2.0-12-generic #14-Ubuntu SMP Mon Sep 28 16:50:34 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux

# dpkg -l bash grep
||/ Name                              Version               Architecture          Description
+++-=================================-=====================-=====================-=========================
ii  bash                              4.3-14ubuntu1         ppc64el               GNU Bourne Again SHell
ii  grep                              2.21-2                ppc64el               GNU grep, egrep and fgrep

** Affects: bash (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bot-comment bugnameltc-131447 severity-low targetmilestone-inin1510
-- 
grep -q gets broken pipe message with multiple expressions
https://bugs.launchpad.net/bugs/1504127
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