linux-kernel - [PATCH 07/22] ver_linux: jfsutils, look for numerical input, not field number

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Date:	Mon, 12 Oct 2015 21:39:47 +0300
From:	Alexander Kapshuk <alexander.kapshuk@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, jim.epost@...il.com, richard@....at,
	tytso@....edu, Alexander Kapshuk <alexander.kapshuk@...il.com>
Subject: [PATCH 07/22] ver_linux: jfsutils, look for numerical input, not field number

Rely on regex to find the version number, rather than rely on numerical input to be found in a particular input field.
Proposed implementation also eliminates the necessity to invoke 'grep' + 'sed' + 'awk'.

Signed-off-by: Alexander Kapshuk <alexander.kapshuk@...il.com>
---
 scripts/ver_linux | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/scripts/ver_linux b/scripts/ver_linux
index 2e1929f..7d85447 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -53,8 +53,12 @@ awk '/^tune2fs/{
 	substr($0,RSTART,RLENGTH))
 }'
 
-fsck.jfs -V 2>&1 | grep version | sed 's/,//' |  awk \
-'NR==1 {print "jfsutils              ", $3}'
+fsck.jfs -V 2>&1 |
+awk '/version/{
+	match($0, /[0-9]+([.]?[0-9]+)+/)
+	printf("Jfsutils\t\t%s\n",
+	substr($0,RSTART,RLENGTH))
+}'
 
 reiserfsck -V 2>&1 | grep ^reiserfsck | awk \
 'NR==1{print "reiserfsprogs         ", $2}'
-- 
2.4.9

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