How do I force a user to log out? [closed]

view full story

http://unix.stackexchange.com – Possible Duplicate: How do you kick a benign user off your system? I'm trying to remove a user account with the userdel -r command. However, it says that it is unable to remove the user because they are still signed in - even if I boot the machine without explicitly using that account it still says this. I've tried using sudo pkill -KILL -u but with no success. Any help appreciated. (HowTos)