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Each process you start is usually completed within a few seconds. Sometimes a background process or a process without a controlling terminal hangs up and you will need to destroy this process by killing it.
To kill a process use the kill command.
kill [-signal] process_identifier (PID)
Use the ps command if you need to find the PID of a process.
Always try to kill a process with a simple kill command.
kill process_identifier
This is the cleanest way to kill a process and has the same effect as cancelling a process.
If this does not work use the -1 (one) signal.
kill -1 process_identifier
This tells the process to hangup just as though you were logging out. The system will attempt to kill any child processes.
As a last resort use the -9 signal:
kill -9 process_identifier
This will stop the process dead in its tracks but it may leave any child processes still running.
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