Check Name Servers for External Domains

So I have a need that I must validate the name servers for my external domains.  I have been trying to come up with a bash script that would read an export of my external view from Infoblox and perform a dig against a public internet DNS server like google or openDNS and provide results in a CSV format.

Ugly way is to first export External View DNS Domains to a txt file (for example ext_domains.txt)

Next create digscript.sh and paste the following

#!/bin/sh
CMD=/usr/bin/dig
CMDOPT=ns
SRV=@8.8.8.8
OPTION1=+noall
OPTION2=+answer
for domain in `cat ${1}`;
        do
        echo $domain
        $CMD $CMDOPT $SRV $domain $OPTION1 $OPTION2
done 

You have to make the file executable.

chmod 755 digscript.sh

Now you can run:

digscript.sh ext_domains.txt > digresults.txt

Clean it up some by running

sed '/^;/ d' < digresults.txt > digresultsout.txt

Now you can open it via Excel with space delimiter