incrementing multiple IP addresses in VIM

Question

I would like to edit my hosts file to match my current IPs, I could do it in Python or AWK, but I was wondering if there is a way in VIM... let's see what I mean, my hosts looks like that: ``` 192.168.11.172 blazer blazer.mydomain 192.168.11.173 faster faster.mydomain ... 192.168.11.225 schurtig schurtig.mydomain ``` Now, I want to increment every IP by 32 so the end result would be: ``` 192.168.11.202 blazer blazer.mydomain 192.168.11.203 faster faster.mydomain ... 192.168.11.257 schurtig schurtig.mydomain ``` If I put my cursor on the right IP, and type 30 and CTRL+A it does what I want. The only problem, I have about 300 hosts ... and I need to do it once every 3 months ... Although I could do it in Python, seeing the file in vim feels safer, because I don't need to run a script and then control the result after that. The following changes only the first line: ``` let i=172 | g/172/s//\=i+30/ ``` I want to repeat this in a loop for different IP ranges being able to say how many tim…

Accepted Answer

Try this:

```
:let i=30 | %s/^$\d*\.\d*\.\d*\.$$\d*$/\=submatch(1).(submatch(2)+i)
```

`$\d*\.\d*\.\d*\.$` (retrieved by `submatch(1)`) matches the IP first three numbers and dots (eg `192.168.11.`) and `$\d*$` (retrieved by `submatch(2)`) matches the IP last number.

I think this is a better way to control it:

```
:let i=30 | %s/^$\d*\.\d*\.\d*\.$$\d*$/\=submatch(1).(submatch(2)+i)/gc
```

incrementing multiple IP addresses in VIM

Solution

Problem