Running script on log rotation?

[nielsk]

For some of my log files I would like to run a script when the logs are rotated with newsyslog. Those are logs that include IPs and I’d like to anonymize those when the rotation is happening. This I would have IPs for the day but on rotation I would like to remove the last two octets.
is that possible? If so, how?

 

[Eric A. Borisch]

Look at newsyslog.conf(5)’s R option. Note you may need to have whatever script you put together pass along a signal to the respective log file’s owner to alert it to rotation.

As for cleaning up the rotated log, I would look to sed(1).