1.\" $NetBSD: kill.1,v 1.28 2017/04/22 23:01:36 christos Exp $ 2.\" 3.\" Copyright (c) 1980, 1990, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Institute of Electrical and Electronics Engineers, Inc. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" @(#)kill.1 8.2 (Berkeley) 4/28/95 34.\" 35.Dd April 22, 2017 36.Dt KILL 1 37.Os 38.Sh NAME 39.Nm kill 40.Nd terminate or signal a process 41.Sh SYNOPSIS 42.Nm 43.Op Fl s Ar signal_name 44.Ar pid 45\&... 46.Nm 47.Fl l 48.Op Ar exit_status 49.Nm 50.Fl signal_name 51.Ar pid 52\&... 53.Nm 54.Fl signal_number 55.Ar pid 56\&... 57.Sh DESCRIPTION 58The 59.Nm 60utility sends a signal to the process(es) specified 61by the pid operand(s). 62.Pp 63Only the super-user may send signals to other users' processes. 64.Pp 65The options are as follows: 66.Bl -tag -width Ds 67.It Fl s Ar signal_name 68A symbolic signal name specifying the signal to be sent instead of the 69default 70.Dv TERM . 71.It Fl l Op Ar exit_status 72Display the name of the signal corresponding to 73.Ar exit_status . 74.Ar exit_status 75may be the exit status of a command killed by a signal 76(see the 77special 78.Xr sh 1 79parameter 80.Sq ?\& ) 81or a signal number. 82.Pp 83If no operand is given, display the names of all the signals. 84.It Fl signal_name 85A symbolic signal name specifying the signal to be sent instead of the 86default 87.Dv TERM . 88.It Fl signal_number 89A non-negative decimal integer, specifying the signal to be sent instead 90of the default 91.Dv TERM . 92.El 93.Pp 94The following pids have special meanings: 95.Bl -tag -width Ds -compact 96.It -1 97If superuser, broadcast the signal to all processes; otherwise broadcast 98to all processes belonging to the user. 99.It 0 100Broadcast the signal to all processes in the current process group 101belonging to the user. 102.El 103.Pp 104Some of the more commonly used signals: 105.Bl -tag -width Ds -compact 106.It 0 1070 (does not affect the process; can be used to test whether the 108process exists) 109.It 1 110HUP (hang up) 111.It 2 112INT (interrupt) 113.It 3 114QUIT (quit) 115.It 6 116ABRT (abort) 117.It 9 118KILL (non-catchable, non-ignorable kill) 119.It 14 120ALRM (alarm clock) 121.It 15 122TERM (software termination signal) 123.El 124.Pp 125.Nm 126is a built-in to 127.Xr csh 1 ; 128it allows job specifiers of the form ``%...'' as arguments 129so process id's are not as often used as 130.Nm 131arguments. 132See 133.Xr csh 1 134for details. 135.Sh DIAGNOSTICS 136.Ex -std 137.Sh SEE ALSO 138.Xr csh 1 , 139.Xr pgrep 1 , 140.Xr pkill 1 , 141.Xr ps 1 , 142.Xr kill 2 , 143.Xr sigaction 2 , 144.Xr signal 7 145.Sh STANDARDS 146The 147.Nm 148utility is expected to be 149.St -p1003.2 150compatible. 151.Sh HISTORY 152A 153.Nm 154command appeared in 155.At v3 156in section 8 of the manual. 157