linux-kernel - [PATCH] tools/vm/slabinfo-gnuplot: Use "grep -E" instead of "egrep"

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Date:   Sat, 19 Nov 2022 10:36:59 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] tools/vm/slabinfo-gnuplot: Use "grep -E" instead of "egrep"

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/vm`

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

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 tools/vm/slabinfo-gnuplot.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/vm/slabinfo-gnuplot.sh b/tools/vm/slabinfo-gnuplot.sh
index 26e193f..873a892 100644
--- a/tools/vm/slabinfo-gnuplot.sh
+++ b/tools/vm/slabinfo-gnuplot.sh
@@ -150,7 +150,7 @@ do_preprocess()
 	let lines=3
 	out=`basename "$in"`"-slabs-by-loss"
 	`cat "$in" | grep -A "$lines" 'Slabs sorted by loss' |\
-		egrep -iv '\-\-|Name|Slabs'\
+		grep -E -iv '\-\-|Name|Slabs'\
 		| awk '{print $1" "$4+$2*$3" "$4}' > "$out"`
 	if [ $? -eq 0 ]; then
 		do_slabs_plotting "$out"
@@ -159,7 +159,7 @@ do_preprocess()
 	let lines=3
 	out=`basename "$in"`"-slabs-by-size"
 	`cat "$in" | grep -A "$lines" 'Slabs sorted by size' |\
-		egrep -iv '\-\-|Name|Slabs'\
+		grep -E -iv '\-\-|Name|Slabs'\
 		| awk '{print $1" "$4" "$4-$2*$3}' > "$out"`
 	if [ $? -eq 0 ]; then
 		do_slabs_plotting "$out"
-- 
2.1.0