linux-kernel - RE: [PATCH] tools: perf: Use "grep -E" instead of "egrep"

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Date:   Mon, 21 Nov 2022 17:05:35 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ian Rogers' <irogers@...gle.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        "Namhyung Kim" <namhyung@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>
Subject: RE: [PATCH] tools: perf: Use "grep -E" instead of "egrep"

From: Ian Rogers
> Sent: 21 November 2022 16:53
...
> My grep is 3.7 and has -E support. ...

As does grep 2.14 on my Ubuntu 13.04 system.

Which isn't that surprising.
IIRC SYSV grep supported -E ~1990 and gnu grep probably had
to match the syntax.

	David

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