Signals

The recommended signals to stop a program, in increasing severity, are TERM (15), INT (2), HUP (1), KILL (9)

The kill command is used to send signals to a program.

• Send a specific signal to a process: kill -INT PID or kill -2 PID

• The same to several processes: kill -2 PID1 PID2 PID3

• Killing processes by name

kill processes processes by name killall http*