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
To revert an unwanted or bad change, work out which revision you want to revert to (see log above) and run:
$ sudo bzr revert --revision <commit number> <file>
For example, to restore the /etc/passwd file to the state it was in in revision 3,
$ sudo bzr revert --revision 3 /etc/passwd
To check for uncommited changes, run (From inside /etc):
$ sudo bzr status
$ sudo bzr status modified: crontab
If you see no output, there are no uncommited changes.