Killing a process in Linux (Easy Guide)

1 List running processes
2 Kill a process by PID
3 Default signal sent by the kill command
3.1 Force killing
4 How to kill all processes by name?
5 How to kill all processes by a user?
6 How to kill a nohup process?
7 How to run a process in the background?
7.1 Using screen command
8 How to kill a background process?
9 How to kill stopped processes?
10 Kill operation not permitted