Send a signal to a process Ctrl-c - Send interrupt, kill -2 Ctrl-z - Send terminal stop and place in background, kill -20 kill -l to list all signals

Common Signals

Number	Name	Meaning
1	HUP	Hangup
2	INT	Interrupt. Ctrl-c
9	KILL	Kill. Kernal terminates process. Last resort.
15	TERM	Terminate default
18	CONT	Continue. Will restore after a STOP/TSTP.
19	STOP	Stop. Pauses the process without terminating.
20	TSTP	Terminal stop. Ctrl-z