Bash programming (the FOR function)

To run a command many times over or to process many linux commands via a bash script.

Can be done by placing the key words in a file one element per line, with no spaces for instance:

the text file is called elements.txt and ti contains:

mydomain.co.za
webhosting.co.za

Then in the shell run this command.

for i in `cat elements.txt `; do dig @ns1.nameserver.com $i; done

This command will loop through the file and dig the name server for each domain in your txt file.

NOTE: remeber to keep the backtick ` do not confuse it with a '