linux-kernel - Re: [PATCH] tools: selftests: Use "grep -E" instead of "egrep"

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Date:   Wed, 23 Nov 2022 08:40:17 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Shuah Khan <skhan@...uxfoundation.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools: selftests: Use "grep -E" instead of "egrep"



On 11/22/2022 11:43 PM, Shuah Khan wrote:
> On 11/18/22 02:28, Tiezhu Yang wrote:
>> The latest version of grep claims the egrep is now obsolete so the build
>> now contains warnings that look like:
>>     egrep: warning: egrep is obsolescent; using grep -E
>> fix this up by moving the related file to use "grep -E" instead.
>>
>>    sed -i "s/egrep/grep -E/g" `grep egrep -rwl tools/testing/selftests`
>>
>> Here are the steps to install the latest grep:
>>
>>    wget http://ftp.gnu.org/gnu/grep/grep-3.8.tar.gz
>>    tar xf grep-3.8.tar.gz
>>    cd grep-3.8 && ./configure && make
>>    sudo make install
>>    export PATH=/usr/local/bin:$PATH
>>
>
> Does this change work without the latest grep? It seems to work on
> grep (GNU grep) 3.7 when I ran quick test on kselftest_deps.sh with
> your change.

Yes, AFAIK, "grep -E" is supported by various versions of grep.

We can see the following NEWS in grep-3.8 release announcement [1]:

"The egrep and fgrep commands, which have been deprecated since
  release 2.5.3 (2007), now warn that they are obsolescent and should
  be replaced by grep -E and grep -F."

[1] https://savannah.gnu.org/forum/forum.php?forum_id=10227

>
>> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
>> ---
>>   .../selftests/ftrace/test.d/preemptirq/irqsoff_tracer.tc       |  8
>> ++++----
>>   tools/testing/selftests/gpio/gpio-sim.sh                       |  2 +-
>>   tools/testing/selftests/kselftest_deps.sh                      |  2 +-
>>   tools/testing/selftests/net/toeplitz.sh                        |  2 +-
>>   tools/testing/selftests/powerpc/scripts/hmi.sh                 |  2 +-
>>   tools/testing/selftests/rcutorture/bin/console-badness.sh      |  2 +-
>>   tools/testing/selftests/rcutorture/bin/kvm-build.sh            |  4
>> ++--
>>   tools/testing/selftests/rcutorture/bin/kvm-find-errors.sh      |  4
>> ++--
>>   tools/testing/selftests/rcutorture/bin/kvm.sh                  |  4
>> ++--
>>   tools/testing/selftests/rcutorture/bin/parse-console.sh        | 10
>> +++++-----
>>   10 files changed, 20 insertions(+), 20 deletions(-)
>>
>
> Please split these into sepratate 5 patches. All rcu changes in one, net in
> one, powerpc  etc.

OK, maybe 6 patches,
(1) rcutorture
(2) ftrace
(3) powerpc
(4) gpio
(5) net
(6) kselftest_deps.sh

>
> The change looks good to me.

Thank you, I will send v2 later.

Thanks,
Tiezhu