kill
kill [-9] <PID>
Risk: Careful
What it does
Sends a signal to a process: TERM (please stop) by default, KILL with -9.
When to use it
A program is stuck. Try the polite way first.
Example
$ kill 1241Ask process 1241 to stop.
$ kill -9 1241Last resort: stop it at once, no tidying up.
$ pkill -f oven-timerStop by name instead of number.
Learn it in: Signals, kill and jobs · Official docs