Does this mean my machine was compromised?
On some linux distros, the first time you use the "sudo" command, you get a little warning message about accepting the responsibility. I entered a "sudo" command in the terminal just now, and got that message. This is not the first time I have used this command and this installation is not new. The only thing I can think of is that some history file somewhere was erased, so the mechanism that outputs that message thought that sudo hadn't been used before. This makes me think that someone gained access to my box and accidentally/overzealously erased their command history.
Any thoughts? What should I do?