If you're administering ProgClub assets, please document your actions on the wiki. See the relevant pages:
See Future Machine Names for the kind of stuff we're on about.
See, or update, Network Administration for work that needs to be done.
$ sudo etckeeper commit "my reasoning here"
after you're done with your changes. There's an auto commit every day, and an autocommit whenever you apt-get install something. You can manually commit your changes as above. To see the commit log for a particular file:
$ sudo bzr log /etc/passwd
TODO: explain how to revert unwanted or mistaken changes.
TODO: explain what to do if you want to check if there are any uncheckedin changes.