List of UNIX signals

Signal Default Action

Term indicates that the process will end immediately

Core indicates that the process ends immediately and cores are dumped (stack trace)

LGN indicates that the process will ignore the signal

Stop indicates that the process is paused

Cont indicates that the process will reply to run

Signal	Value	Action	Comments
SIGHUP	1	Term	Issued when the control terminal or control process terminates
SIGINT	2	Term	Interrupt signal from the keyboard (usually ctrl-c)
Sigquit	3	Core	Exit signal from the keyboard (usually ctrl-/)
Sigill	4	Core	Illegal instructions
Sigabrt	6	Core	Termination signal from Abort
SIGFPE	8	Core	Floating-point number exception
SIGKILL	9	Term	Kill Signal
SIGSEGV	11	Core	Illegal memory address reference
Sigpipe	13	Term	Pipe damage (broken pipe): Write information to a pipeline that does not have a read process
Sigalrm	14	Term	Timer-to-time signal from alarm
SIGTERM	15	Term	Terminating signal
SIGUSR1	30,10,16	Term	User-defined Signal 1
SIGUSR2	31,12,17	Term	User-defined Signal 2
SIGCHLD	20,17,18	Ign	Child process stopped or terminated
Sigcont	19,18,25	Cont	If stopped, continue execution
SIGSTOP	17,19,23	Stop	Stop Process Execution (from non-terminal)
Sigtstp	18,20,24	Stop	Stop signal from the terminal
Sigttin	21,21,26	Stop	Terminal input for background processes
Sigttou	22,22,27	Stop	Terminal output of the background process

List of UNIX signals