MySQL command log

I've done it before, but I cant remember how to view the commands that have been sent to MySQL. I normally try not to ask MySQL questions here even though it's pretty much a standard with PHP :) But I have exhausted myself in researching the problem and I hope one of you might have the answer. A friend had his server hacked and they thought it would be funny to change the username and password to the mysql table in mysql plus a couple other tables.... We're hunting now ;) Thanks ahead of time! Rick