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.\"-
.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Institute of Electrical and Electronics Engineers, Inc.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)kill.1 8.2 (Berkeley) 4/28/95
.\" $FreeBSD: releng/12.1/bin/kill/kill.1 314436 2017-02-28 23:42:47Z imp $
.\"
.Dd October 3, 2016
.Dt KILL 1
.Os
.Sh NAME
.Nm kill
.Nd terminate or signal a process
.Sh SYNOPSIS
.Nm
.Op Fl s Ar signal_name
.Ar pid ...
.Nm
.Fl l
.Op Ar exit_status
.Nm
.Fl Ar signal_name
.Ar pid ...
.Nm
.Fl Ar signal_number
.Ar pid ...
.Sh DESCRIPTION
The
.Nm
utility sends a signal to the processes specified by the
.Ar pid
operands.
.Pp
Only the super-user may send signals to other users' processes.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl s Ar signal_name
A symbolic signal name specifying the signal to be sent instead of the
default
.Dv TERM .
.It Fl l Op Ar exit_status
If no operand is given, list the signal names; otherwise, write
the signal name corresponding to
.Ar exit_status .
.It Fl Ar signal_name
A symbolic signal name specifying the signal to be sent instead of the
default
.Dv TERM .
.It Fl Ar signal_number
A non-negative decimal integer, specifying the signal to be sent instead
of the default
.Dv TERM .
.El
.Pp
The following PIDs have special meanings:
.Bl -tag -width indent
.It -1
If superuser, broadcast the signal to all processes; otherwise broadcast
to all processes belonging to the user.
.El
.Pp
Some of the more commonly used signals:
.Pp
.Bl -tag -width indent -compact
.It 1
HUP (hang up)
.It 2
INT (interrupt)
.It 3
QUIT (quit)
.It 6
ABRT (abort)
.It 9
KILL (non-catchable, non-ignorable kill)
.It 14
ALRM (alarm clock)
.It 15
TERM (software termination signal)
.El
.Pp
Some shells may provide a builtin
.Nm
command which is similar or identical to this utility.
Consult the
.Xr builtin 1
manual page.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Terminate
the processes with PIDs 142 and 157:
.Pp
.Dl "kill 142 157"
.Pp
Send the hangup signal
.Pq Dv SIGHUP
to the process with PID 507:
.Pp
.Dl "kill -s HUP 507"
.Pp
Terminate the process group with PGID 117:
.Pp
.Dl "kill -- -117"
.Sh SEE ALSO
.Xr builtin 1 ,
.Xr csh 1 ,
.Xr killall 1 ,
.Xr ps 1 ,
.Xr sh 1 ,
.Xr kill 2 ,
.Xr sigaction 2
.Sh STANDARDS
The
.Nm
utility is expected to be
.St -p1003.2
compatible.
.Sh HISTORY
A
.Nm
command appeared in
.At v3
in section 8 of the manual.
.Sh BUGS
A replacement for the command
.Dq Li kill 0
for
.Xr csh 1
users should be provided.
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