Singnals in Linux

Singnals in Linux
Terminate or send a signal with kill or killall

# kill -s TERM 4712 ——– same as kill -15 4712
# killall -1 httpd ——– Kill HUP processes by exact name
# pkill -9 http ——– Kill TERM processes by (part of) name
# pkill -TERM -u www ——- Kill TERM processes owned by www
# fuser -k -TERM -m /home —— Kill every process accessing /home
(to umount)

Important signals are:

-1 HUP (hang up)
-2 INT (interrupt)
-3 QUIT (quit)
-9 KILL (non-catchable, non-ignorable kill)
-15 TERM (software termination signal)