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bash script to resolve all hostnames in a list

Posted on 2016-07-31
Last Modified: 2016-07-31
Hi Guys,
I have a list of over 100 domains.
I need to get the A record of each one of them through a bash script.
I also need the same bash script to write the resolve next to FQDN itself...
Meaning, before the script:
cat /home/user/domains.list

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will return

and after the script it will return
Question by:David Sankovsky
  • 5
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LVL 83

Expert Comment

by:Dave Baldwin
ID: 41736239
I'm curious what you are going to do with them.  I ask because your two examples, google.com and amazon.com have not just one but many IP addresses.

Author Comment

by:David Sankovsky
ID: 41736243
You are correct Dave but they are only examples. in my scenario I know for a fact that no one will have more than one resolve, I do however expect some to return nxdomain.

The point is simple I have a plesk server we wish to close that has over 100 FQDNs. We want to close this server, we just need to know which domains still actually point to this server.
LVL 83

Expert Comment

by:Dave Baldwin
ID: 41736246
Interesting.  I would have thought that the Plesk software would tell you that.  Or do you know that some have moved to other servers already?
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LVL 83

Expert Comment

by:Dave Baldwin
ID: 41736252
I just wrote a PHP script that does the lookup for my own websites.  I can post that if you want.

Author Comment

by:David Sankovsky
ID: 41736262
Might even be better I could integrate that into one of my management sites...
LVL 83

Accepted Solution

Dave Baldwin earned 500 total points
ID: 41736669
This just displays the name and IP, one to a row.  Substitute you domain names but make sure and observe the punctuation.   You could collect them into a variable and save it to a file fairly easily.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

$hostz = array(
	, "www.Yoursite.org"
	, "www.Yoursite.net"
	, "www.Yoursite.info"

foreach($hostz as $value) {
	echo $value." = ";
	$ip = gethostbyname($value);
	echo $ip."<br>";

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Author Comment

by:David Sankovsky
ID: 41737004
ok, now I just need to make that read from a file.
Thanks a lot :)
LVL 83

Expert Comment

by:Dave Baldwin
ID: 41737010
You're welcome, glad to help.

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