linux-kernel - [PATCH 1/2] torture: Select line in sed and replace grep

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Date:   Tue, 22 Feb 2022 13:07:16 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Zhouyi Zhou <zhouzhouyi@...il.com>, rcu@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] torture: Select line in sed and replace grep

sed’s switch `-n` (`--silent`) suppresses the automatic printing of
the pattern space, therefore, allowing to replace grep by only
printing the current pattern space using the command `p`.

Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 tools/testing/selftests/rcutorture/bin/functions.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh
index c35ba24f994c..5cff520955e6 100644
--- a/tools/testing/selftests/rcutorture/bin/functions.sh
+++ b/tools/testing/selftests/rcutorture/bin/functions.sh
@@ -301,7 +301,7 @@ specify_qemu_cpus () {
 			echo $2 -smp $3
 			;;
 		qemu-system-ppc64)
-			nt="`lscpu | grep '^NUMA node0' | sed -e 's/^[^,]*,\([0-9]*\),.*$/\1/'`"
+			nt="`lscpu | sed -n -e '/^NUMA node0/s/^[^,]*,\([0-9]*\),.*$/\1/p'`"
 			echo $2 -smp cores=`expr \( $3 + $nt - 1 \) / $nt`,threads=$nt
 			;;
 		esac
-- 
2.35.1