Thread: Linux / Unix Shell Script To Edit DNS zone files

Hello,
I have been trying to come up with a script to parse a DNS master zone file and manipulate it to point to a new IP address, but to no avail. It sounds simple and I'm sure it is, however I don't believe my Linux knowledge expands quite that far yet. I would greatly appreciate any assistance.
I'm using Centos 6.3

--nixCraft Forum newcomer

Hello,

what you have tried ?
check this page for the same

Originally Posted by Rahul.Patil

Hello,

what you have tried ?
check this page for the same

Rahul,
I spent many hours scouring the net and found something that I thought was going to work. Someone had posted a thread (not on this forum I believe and I can't seem to locate it any longer) about using sed to parse the zone file and look for a specific pattern (the IP address that points to the domain) and change it accordingly.

I've peeked at what you linked and so far it looks very promising, so thank you, profusely. I will try to work with that and see what I can come up with.

Rahul,
The link you posted is good and I like it and will probably use it for future projects, but I want to be able to change JUST the IP address in the zone file automatically, without my intervention.

I was thinking about in place of the IP address denoted in the zone file, I could use command substitution such as:

Code:

$(cat /path/to/ip_file)

and then just have that file it is referencing automatically updated as necessary. Think this could work?


--nixCraft Forum newcomer

Use sed command search and replace.

Code:

sed 's/OLD-IP-HERE/NEW-IP-HERE/' input > output
sed -i 's/OLD-IP-HERE/NEW-IP-HERE/' input
## replace 202.1.2.3 with 99.1.2.3
sed -i 's/202.1.2.3/99.1.2.3/' /path/to/zone.db

Also, you need to backup zone.db before making any changes.

Originally Posted by nixcraft

Use sed command search and replace.

Code:

sed 's/OLD-IP-HERE/NEW-IP-HERE/' input > output
sed -i 's/OLD-IP-HERE/NEW-IP-HERE/' input
## replace 202.1.2.3 with 99.1.2.3
sed -i 's/202.1.2.3/99.1.2.3/' /path/to/zone.db

Also, you need to backup zone.db before making any changes.

Awesome-sauce Nixcraft!!! Thank you so much! This worked excellently. I appreciate the guidance greatly.

--Nixcraft newcomer