Force user logout!

have you ever wanted to know how to force logout of a user on a remote machine that is logged in locally ( or remotely too :P )?

here the tip:

kill -15 $(ps -U NameOfUserToLogout -o "pid=")

what does it mean this command??
well why dont you type in your command line these other two commands:

man kill
man ps

you will learn more, guaranteed :D