linux-kernel - [PATCH 09/22] ver_linux: xfsprogs, look for numerical input, not field number

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Message-Id: <1444675202-1375-9-git-send-email-alexander.kapshuk@gmail.com>
Date:	Mon, 12 Oct 2015 21:39:49 +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 09/22] ver_linux: xfsprogs, 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' + '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 65d4c02..a926225 100755
--- a/scripts/ver_linux
+++ b/scripts/ver_linux
@@ -70,8 +70,12 @@ awk '/^reiserfsck/{
 fsck.reiser4 -V 2>&1 | grep ^fsck.reiser4 | awk \
 'NR==1{print "reiser4progs          ", $2}'
 
-xfs_db -V 2>&1 | grep version | awk \
-'NR==1{print "xfsprogs              ", $3}'
+xfs_db -V 2>&1 |
+awk '/version/{
+	match($0, /[0-9]+([.]?[0-9]+)+/)
+	printf("Xfsprogs\t\t%s\n",
+	substr($0,RSTART,RLENGTH))
+}'
 
 pccardctl -V 2>&1| grep pcmciautils | awk '{print "pcmciautils           ", $2}'
 
-- 
2.4.9

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