Always keep a notebook of what you do as root. That way,
when you can't remember what you did at 3am (small wonder),
all you have to do is trace your steps back.
This can be kept online as well.
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.