Advanced scripting challege

[John J Read]

Hoping someone can help me with ideas or better yet, script syntax to the problem below.

I'd be extremely grateful and would be happy to share the full script if anyone is interested.

I have been working on a posix shell script that collects filesystem and volume group info on server which I can then use to duplicate the volume groups, LV's, filesystems structure on a new server. This will be used at my Disaster Recovery site to quickly build the external volume groups and filesystems after the Ignite Recovery.

I've build a script to provide the following output. The numbers represent number of disk devices in each VG.

vg10_disk_list 0 1 2 3
vg01_disk_list 4 5 6 7
vg46_disk_list 8 9 10 11 12

I initialized an array with each member being a disk device:

print "${dsks[0]}"
/dev/dsk/c1t7d3

print "${dsks[1]}"
/dev/dsk/c1t7d4

etc...


Now all I need to do, and the challenge I present to you is:

Provide syntax to change the following:

FROM:
vg10_disk_list 0 1 2 3

TO:
vg10_disk_list="${dsks[0]} ${dsks[1]} ${dsks[2]} ${dsks[3}"

Too many special characters for my scripting and pattern matching skills. I'm open to using another scripting language such as Perl if that suits the task better.

Let me know if you have any ideas. Currently, I just type in those array elements by hand. Otherwise the script is fully automated to capture and duplicate external disk configurations for any Unix server.

Thanks!

-john read

[John J Read]

There was a light typo:

The correct challenge is to change the following:

FROM:
vg10_disk_list 0 1 2 3

TO:
vg10_disk_list="${dsks[0]} ${dsks[1]} ${dsks[2]} ${dsks[3]}"

thanks again.

[Sridhar Bhaskarla · Accepted solution]

Hi,

You can manipulate STR variable here and generate the output for as many variables as you need.


STR="vg10_disk_list 0 1 2 3"
VG=$(echo $STR|awk '{print $1}')
printf "$VG=\""
for I in $(echo $STR |sed 's/'$VG'//g')
do
printf "\$\{dsks\[$I\]\}"
done
printf "\"\n"

-Sri

[Chris Vail]

Try some variation of this:
#/bin/ksh
COUNTER1=1
for DEV in `lvdisplay -v /dev/YOURVG/YOURLVOL|grep dsk|awk '{ print $2 }'|uniq`
do
DSK[$COUNTER1]=$DEV
(( COUNTER1 = "$COUNTER1" +"1" ))
done

This will pass the /dev/dsk/cXtXdX info to the subscripted variable DSK. The variable will count from 1 up instead of 0 up.


Chris

[John J Read]

Thanks! Here's how the final version ended up.


Source file:
#cat $vg_diskfile
vg07_disk_list 0 1 2 3 4 5 6 7 8 9 10 11 12 13
vg28_disk_list 14
vg11_disk_list 15 16 17 18


Script to make changes:
#!/bin/sh

vg_diskfile=/home/n721jjr/DR/vg_diskfile

LINES=`wc -l $vg_diskfile |awk '{print $1}'`
COUNT=1

while [[ $LINES -ge $COUNT ]]
do

STR=`sed -n ${COUNT}p $vg_diskfile`
VG=$(echo $STR|awk '{print $1}')
printf "$VG=\""
for I in $(echo $STR |sed 's/'$VG'//g')
do
printf "\$\{dsks\[$I\]\} "
done
printf "\"\n"
COUNT=$(($COUNT+1))

done



output:
vg07_disk_list="${dsks[0]} ${dsks[1]} ${dsks[2]} ${dsks[3]} ${dsks[4]} ${dsks[5]} ${dsks[6]} ${dsks[7]} ${dsks[8]} ${dsks[9]} ${dsks[10]} ${dsks[11]} ${dsks[12]} ${dsks[13]} "
vg28_disk_list="${dsks[14]} "
vg11_disk_list="${dsks[15]} ${dsks[16]} ${dsks[17]} ${dsks[18]} "


ps. I also liked the second response!


Thanks again.