Need shell script to find IPs when instance names are known

[Shivkumar]

Hi,

I have a file having instance names.

Say for example:
abc
def
lmn
opr
xyz

I want to find IP corrresponding to each of the instance and want to write in a new file
having instance and its IP.

Can someone suggest a shell script ?

Thanks,
Shiv

[James R. Ferguson · Accepted solution]

Hi Shiv:

Perhaps you want:

#!/usr/bin/sh
while read LAN X do
ifconfig ${LAN}|awk 'NR==1 {LAN=$1};NR==2 {print LAN,$2}'
done < fileofnames

Regards!

...JRF...

[Shivkumar]

In case i want to use nslookup on each of the instance having listed in a text file. Then how the script will look like ?

[Mel Burslan]

would you be looking for something like this then ?

for i in `cat /tmp/fileofinstances`
do
name=`ifconfig $i | awk 'NR==2 {print LAN,$2}'| \
nslookup|grep ^Name|cut -d: -f2| tr -s " "|cut -d" " -f 2`
echo $i" "$name
done