kill flags & options

-15, SIGTERM

Gracefully terminate a process. This is the default signal.

kill 1234

kill -15 1234

-9, SIGKILL

Force-kill a process immediately. Cannot be caught or ignored.

kill -9 1234

-l

List all available signal names.

kill -l

-s

Send a specific signal by name.

kill -s HUP 1234

kill -s USR1 1234

-1, SIGHUP

Hang up signal. Often used to reload daemon configuration.

kill -1 $(pidof nginx)

-2, SIGINT

Interrupt signal. Same as pressing Ctrl+C.

kill -2 1234

-STOP, -CONT

Pause and resume a process.

kill -STOP 1234

kill -CONT 1234

killall

Kill processes by name instead of PID. Separate command but related.

killall node

killall -9 python