[lkml]   [2022]   [Nov]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] tools: perf: Use "grep -E" instead of "egrep"

On 11/20/2022 02:17 AM, Ian Rogers wrote:
> On Fri, Nov 18, 2022 at 1:17 AM 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/perf`
>> Here are the steps to install the latest grep:
>> wget
>> tar xf grep-3.8.tar.gz
>> cd grep-3.8 && ./configure && make
>> sudo make install
>> export PATH=/usr/local/bin:$PATH
>> Signed-off-by: Tiezhu Yang <>
> Hi Tiezhu,
> installing a newer grep tool in order to build/test perf is somewhat
> burdensome, as such I don't think we should merge this change. Looking
> at my Debian derived distro. I have grep 3.7, so I'd need to do this.
> I imagine the majority of people are using a grep earlier than 3.8. I
> agree there is a problem perhaps we can:
> - rewrite to just need grep and not egrep;
> - rewrite in a stable language with regex support, perhaps python;
> - have a grep/egrep wrapper that selects based on version number.

Hi Ian,

I found this issue on Linux From Scratch system which uses grep 3.8 [0],
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."

Additionally, the next grep rpm/deb version is 3.8 on Fedora [2]
and Debian [3], so use "grep -E" instead of "egrep" so we won't see
the warning for various versions of grep.



 \ /
  Last update: 2022-11-21 04:00    [W:0.156 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site