killall - Terminates all processes started by the user, except the calling
/usr/sbin/killall [- | [-]signal_name | -signal_number]
- The hyphen character (without an argument) sends a SIGTERM signal ini-
tially and then sends a SIGKILL signal to all processes that survive
for 30 seconds after receipt of the first signal. This gives processes
that catch the SIGTERM signal an opportunity to clean up.
A signal name, optionally preceded by a hyphen, sends the specified
signal to processes.
The hyphen character (with a signal number argument) sends the speci-
fied signal, either a name, stripped of the SIG prefix (such as KILL),
or a number (such as 9). For information about signal names and
numbers, see the signal() system call.
In the System V habitat, the optional signal number does not have to be
preceded with a hyphen (-).
-l Lists signal names in numerical order (as given in the
/usr/include/signal.h file), stripped of the common SIG prefix.
This command provides a convenient means of killing all processes created
by the shell that you control. When started by the superuser, the killall
command kills all processes that can be terminated, except those processes
that started it, the kernel processes, and processes 0 and 1(init).
This command is modified in all security configurations of the system.
1. To stop all background processes that have started, enter:
This sends all background processes signal 9 (the kill signal, also
2. To stop all background processes, giving them a chance to clean up,
This sends signal 15 (SIGTERM), waits 30 seconds, and then sends sig-
nal 9 (SIGKILL).
3. To send a specific signal to the background processes, enter:
This sends signal 2 (SIGINT) to the background processes.
4. To list the signal names in numerical order, stripped of the SIG pre-
This displays a list of signals, which may vary from system to system.
Specifies the command path
Functions: kill(2), sigaction(2), signal(2)