topic Re: Problem replacing text in a script in Operating System - HP-UX

Problem replacing text in a script

Gus Mestousis — Thu, 05 Dec 2002 23:00:28 GMT

I am trying to write a script that gets the value of the logival volume an application is on and then adds an r after the volume group so that I can run fsadm on it.
Somthing along the lines of cat /etc/fstab |grep $APPHOME |awk '{ print $1 }' sed ?????

How would I insert the "r" into /dev/vg01/lvol6, sometimes clients use different naming conventions ... /dev/vg02/appname

Thanks!

Re: Problem replacing text in a script

Sridhar Bhaskarla — Thu, 05 Dec 2002 23:09:00 GMT

I would do the following quickly -

....
...
for ENTRY in $(grep $APPHOME /etc/fstab|awk '{print $1}')
do
LVOL=$(echo $ENTRY|awk '{FS="/";print $4}')
RLVOL=$(echo $ENTRY|sed 's/'$LVOL'/r'$LVOL'/')
echo $RLVOL
done

-Sri

Re: Problem replacing text in a script

Rajeev Shukla — Thu, 05 Dec 2002 23:48:24 GMT

Other simple one would be
LVOL=`cat /etc/fstab|grep $APPHOME|awk -F / '{print $4}'`
VG=`cat /etc/fstab|grep $APPHOME|awk -F / '{print $3}'`

And when you want to substitute with 'r' you can do it

RLVOL=/dev/${VG}/r${LVOL}

cheers
Rajeev

Re: Problem replacing text in a script

john korterman — Fri, 06 Dec 2002 08:37:00 GMT

Hi Gus,

you could use the korn shell's built-in functions for string handling, e.g.:

#!/usr/bin/sh

APPHOME=$1

cat /etc/fstab | grep $APPHOME | while read line
do
LVOL=`echo $line | awk '{print $1}'`
ENDING=`basename $LVOL`
BEGINNING="${LVOL%%$ENDING}"
echo ${BEGINNING}r${ENDING}
done
~
regards,
John K.

Re: Problem replacing text in a script

Robin Wakefield — Fri, 06 Dec 2002 08:47:38 GMT

Hi Gus,

grep $APPHOME /etc/fstab | awk '{print $1}' | sed 's+.*/+&r+'

Rgds, Robin

Re: Problem replacing text in a script

F. X. de Montgolfier — Mon, 09 Dec 2002 13:50:15 GMT

Hi,

bdf gives you the name of the lv your application is using.

I prefer using bdf to grepping it from fstab, as it will give you the logical volume the application is installed on even if it is sharing its logical volume...

#[SAVE]> bdf /tmp/test/
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol4 1024000 40785 921815 4% /tmp

The following command should, (though there might be tyops: I don't have access to my system fron here), give you the correct answer:

bdf $APPHOME |grep /dev/ |sed 's!(\^[^ ]+/\)!\1r!'|awk '{print $1}'

The bdf part will give you the logical volume on which your application resides, the grep will ensure that only the relevant line is printed, the sed will find the longest string containing a '/' since the begining of the line, and add 'r'after it, and the awk will print only the first argument...

I won't promise that the command is _fast_, though ;-)

Cheers,

Fran??ois-Xavier

Re: Problem replacing text in a script

H.Merijn Brand (procura — Mon, 09 Dec 2002 14:01:59 GMT

a5:/ 108 # grep -v nfs /etc/fstab
/dev/vg00/lvol3 / vxfs delaylog 0 1
/dev/vg00/lvol1 /stand hfs defaults 0 1
/dev/vg00/tmp /tmp vxfs rw,suid,largefiles,delaylog,datainlog 0 2
/dev/vg00/lvol7 /usr vxfs delaylog 0 2
/dev/vg00/var /var vxfs delaylog 0 2
/dev/vg00/opt /opt vxfs delaylog 0 2
/dev/vg00/home /home vxfs delaylog 0 2
/dev/vg00/u /u vxfs rw,suid,largefiles,delaylog,datainlog 0 2
/dev/vg00/pro /pro vxfs rw,suid,largefiles,delaylog,datainlog 0 2
/dev/vg00/data /data vxfs rw,suid,largefiles,delaylog,datainlog 0 2
/dev/vg00/wrk /wrk vxfs rw,suid,largefiles,delaylog,datainlog 0 2
/dev/cd0 /cdrom cdfs ro,rr,noauto 0 0
a5:/ 109 # echo $APPHOME
/pro
a5:/ 110 # perl -nle'/$ENV{APPHOME}/&&s:\s.*::&&s:vg\d+/:$&r:&&print' /etc/fstab
/dev/vg00/rpro
a5:/ 111 #

Re: Problem replacing text in a script

F. X. de Montgolfier — Mon, 09 Dec 2002 14:04:37 GMT

Sorry, following up on myself...

I don't know why I insisted on using awk when sed is enough for the job...
Let's try doing it right this time:

bdf $APPHOME |grep /dev/ |sed 's!(\^[^ ]+/\)(\[^ ]+\).+!\1r\2!'

- ^[^ ]+/ should give you the basename of your logical volume,
- [^ ]+ should give you the logical volume name,
- the .+ is there to engulf all the rest of the line

Please remember that this is untested, as I don't have access to my platform. It should be near the mark, though...

Cheers,

Fran??ois-Xavier

Re: Problem replacing text in a script

Gus Mestousis — Mon, 09 Dec 2002 14:13:33 GMT

Thanks for all the great replies.

Enjoy your holidays!

Gus

Re: Problem replacing text in a script

Steven E. Protter — Mon, 09 Dec 2002 17:16:49 GMT

Attached is a perl script that handles this based on creating filelists. Be careful using it on /etc files,but it works, is easy to modify and understand.

It actually uses sed btw.

Steve

Re: Problem replacing text in a script

H.Merijn Brand (procura — Mon, 09 Dec 2002 17:24:06 GMT

Ahhhhhhrgggggg, someone still using perl4!

Never use this, not even as an example.
And *if* you need using perl4, at least add -w to the command line.

When converting this to perl5, start with something like

#!/usr/local/bin/perl

use strict;
use warnings;
use File::Find;
use Sys::Hostname;

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