Show all running processes: ps -ef
Live hit-parade of processes (press P, M, T: sort by Processor, Memory or Time usage): top 
Send a termination signal to a process: kill < pid> (number found in ps output)
Have the kernel kill a process: kill -9 
Kill all processes (at least all user ones): kill -9 -1
Kill a graphical application: xkill (click on the program window to kill) 


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