KILL(1)

NAME
kill - terminate or signal a process

SYNOPSIS
kill [-s signal_name] pid ...
kill -l [exit_status]
kill - signal_name pid ...
kill - signal_number pid ...

DESCRIPTION
The kill utility sends a signal to the processes specified by the pid operands.

Only the super-user may send signals to other users' processes.

The options are as follows:

-s signal_name
    A symbolic signal name specifying the signal to be sent instead of the default TERM.

-l [exit_status]
    If no operand is given, list the signal names; otherwise, write the signal name corresponding to exit_status.

- signal_name
    A symbolic signal name specifying the signal to be sent instead of the default TERM.

- signal_number
    A non-negative decimal integer, specifying the signal to be sent instead of the default TERM.

The following PIDs have special meanings:

-1  If superuser, broadcast the signal to all processes; otherwise broadcast to all processes belonging to the user.

Some of the more commonly used signals:

1   HUP (hang up)
2   INT (interrupt)
3   QUIT (quit)
6   ABRT (abort)
9   KILL (non-catchable, non-ignorable kill)
14  ALRM (alarm clock)
15  TERM (software termination signal)

Some shells may provide a builtin kill command which is similar or identical to this utility. Consult the builtin(1) manual page.

EXIT STATUS

EXAMPLES
Terminate the processes with PIDs 142 and 157:

    kill 142 157

Send the hangup signal (SIGHUP) to the process with PID 507:

    kill -s HUP 507

Terminate the process group with PGID 117:

    kill -- -117

SEE ALSO
builtin(1), csh(1), killall(1), ps(1), sh(1), kill(2), sigaction(2)

STANDARDS
The kill utility is expected to be p1003.2 compatible.

HISTORY
A kill command appeared in AT&T UNIX.

BUGS
A replacement for the command “kill 0” for csh(1) users should be provided.