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kill

NAME

kill - send a signal to a process

SYNOPSIS

kill [ -signal | -s signal ] pid ...
kill [ -L | -V, --version ]
kill -l [ signal ]

DESCRIPTION

The default signal for kill is TERM. Use -l or -L to list available signals. Particularly useful signals include HUP, INT, KILL, STOP, CONT, and 0. Alternate signals may be specified in three ways: -9 -SIGKILL -KILL. Negative PID values may be used to choose whole process groups; see the PGID column in ps command output. A PID of -1 is special; it indicates all processes except the kill process itself and init.

SIGNALS

The signals listed below may be available for use with kill. When known constant, numbers and default behavior are shown.

Name	Num	Action	Description
0	0	n/a	exit code indicates if a signal may be sent
ALRM	14	exit
HUP	1	exit
INT	2	exit
KILL	9	exit	this signal may not be blocked
PIPE	13	exit
POLL		exit
PROF		exit
TERM	15	exit
USR1		exit
USR2		exit
VTALRM		exit
STKFLT		exit	may not be implemented
PWR		ignore	may exit on some systems
WINCH		ignore
CHLD		ignore
URG		ignore
TSTP		stop	may interact with the shell
TTIN		stop	may interact with the shell
TTOU		stop	may interact with the shell
STOP		stop	this signal may not be blocked
CONT		restart	continue if stopped, otherwise ignore
ABRT	6	core
FPE	8	core
ILL	4	core
QUIT	3	core
SEGV	11	core
TRAP	5	core
SYS		core	may not be implemented
EMT		core	may not be implemented
BUS		core	core dump may fail
XCPU		core	core dump may fail
XFSZ		core	core dump may fail

NOTES

Your shell (command line interpreter) may have a built-in kill command. You may need to run the command described here as /bin/kill to solve the conflict.

EXAMPLES

kill -9 -1

Kill all processes you can kill.

kill -l 11

Translate number 11 into a signal name.

kill -L

List the available signal choices in a nice table.

kill 123 543 2341 3453

Send the default signal, SIGTERM, to all those processes.

SEE ALSO

pkill(1), skill(1), kill(2), renice(1), nice(1), signal(7), killall(1).

STANDARDS

This command meets appropriate standards. The -L flag is Linux-specific.

AUTHOR

Albert Cahalan <albert@users.sf.net> wrote kill in 1999 to replace a bsdutils one that was not standards compliant. The util-linux one might also work correctly.

Please send bug reports to <procps-feedback@lists.sf.net>