Shell Programming and Scripting

Hi,

I have a script that fetches only specific information from fcinfo command. Below is a portion of the script.

#!/usr/bin/ksh
set -x
HBA_COUNT=`sudo fcinfo hba-port | grep -i state | awk 'END{print NR}'`
echo "$HBA_COUNT HBAs exist"
echo '........'

INDEX=1
while [wiki] $INDEX -le $HBA_COUNT [/wiki] ; do

HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==$INDEX' | awk '{print $NF}'`
print 'WWN:'
print ${HBA_STAT[$INDEX]}
(( INDEX=$INDEX+1 ))

done

The part in red is where I'm having trouble with. When I type
sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==1' | awk '{print $NF}'
into the command line, I have no problem displaying the WWN info (where the value in blue can vary).

Also, I noticed something funny where if i replace (in the script)
HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR==$INDEX' | awk '{print $NF}'`
with
HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'state' | awk 'NR==$INDEX' | awk '{print $NF}'`
it still doesn't work, but once I change 'NR==$INDEX' with '$NR==INDEX', it works...
Can someone explain why this is happening and maybe correct me on the syntax if I'm doing something wrong?

Thanks

The shell don't expand shell variables within single quotes, try this:

Code:

HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk 'NR=='$INDEX | awk '{print $NF}'`

or with a awk variable:

Code:

HBA_STAT[$INDEX]=`sudo fcinfo hba-port | grep -i 'Port WWN' | awk -v var=$INDEX 'NR==var' | awk '{print $NF}'`

Thanks so much Franklin52 . The second method doesn't work but the first one does.