IABSD.fr/src/bin/kill/kill.1

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• Author : schwarze
  Date : 2025-04-24 14:15:29
  Hash : d2877cdf
  Message : Combine three almost identical synopsis lines into a single one, and three almost identical entries in the options list likewise, bcause all three have identical meaning and almost identical syntax. While here, call the list of signals in signal(3) "complete" rather than "more complete", because that's also true, a stronger statement, and more concise. OK jmc@

• bin/kill/kill.1

• .\"	$OpenBSD: kill.1,v 1.43 2025/04/24 14:15:29 schwarze Exp $
  .\"	$NetBSD: kill.1,v 1.8 1995/09/07 06:30:26 jtc Exp $
  .\"
  .\" Copyright (c) 1980, 1990, 1993
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  .\" the Institute of Electrical and Electronics Engineers, Inc.
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  .\"
  .\"	@(#)kill.1	8.2 (Berkeley) 4/28/95
  .\"
  .Dd $Mdocdate: April 24 2025 $
  .Dt KILL 1
  .Os
  .Sh NAME
  .Nm kill
  .Nd terminate or signal a process
  .Sh SYNOPSIS
  .Nm kill
  .Op Fl Ar signal_number | Fl Ar signal_name | Fl s Ar signal_name
  .Ar pid ...
  .Nm kill
  .Fl l
  .Op Ar exit_status
  .Sh DESCRIPTION
  The
  .Nm
  utility sends a signal to the process(es) specified
  by the
  .Ar pid
  operand(s).
  If no signal is specified, the
  .Cm TERM
  signal is used.
  .Pp
  Only the superuser may send signals to other users' processes.
  .Pp
  The options are as follows:
  .Bl -tag -width Ds
  .It Fl l Op Ar exit_status
  Display the name of the signal corresponding to
  .Ar exit_status .
  .Ar exit_status
  may be the exit status of a command killed by a signal
  (see the
  special
  .Xr sh 1
  parameter
  .Sq ?\& )
  or a signal number.
  .Pp
  If no operand is given, display the names of all the signals.
  .It Fl Ar signal_number | Fl Ar signal_name | Fl s Ar signal_name
  A non-negative decimal integer or a symbolic name
  specifying the signal to be sent instead of the default
  .Cm TERM .
  .El
  .Pp
  The following PIDs have special meanings:
  .Bl -tag -width Ds -offset indent
  .It \-1
  If superuser, broadcast the signal to all processes; otherwise, broadcast
  to all processes belonging to the user.
  .It 0
  Send the signal to all processes whose group ID is equal to the
  process group ID of the sender, and for which the process has permission.
  .It \- Ns Ar pgid
  Send the signal to all processes within the specified process group.
  .El
  .Pp
  Some of the more commonly used signals:
  .Pp
  .Bl -column MM MMMM -compact -offset indent
  .It 1  Ta Cm HUP  Ta Pq hang up
  .It 2  Ta Cm INT  Ta Pq interrupt
  .It 3  Ta Cm QUIT Ta Pq quit
  .It 6  Ta Cm ABRT Ta Pq abort
  .It 9  Ta Cm KILL Ta Pq non-catchable, non-ignorable kill
  .It 14 Ta Cm ALRM Ta Pq alarm clock
  .It 15 Ta Cm TERM Ta Pq software termination signal
  .El
  .Pp
  For a complete list, consult the
  .Xr signal 3
  manual page.
  .Pp
  A signal number of 0
  .Pq Nm kill Fl 0 Ar pid
  does not send a signal, but only checks the validity of a certain PID.
  It succeeds if
  .Ar pid
  exists or raises an error otherwise.
  .Sh EXIT STATUS
  .Ex -std kill
  .Sh EXAMPLES
  Forcibly terminate process ID 1234:
  .Pp
  .Dl $ kill -9 1234
  .Pp
  Send the
  .Xr init 8
  process the hangup signal, instructing it to re-read
  .Xr ttys 5 :
  .Pp
  .Dl # kill -HUP 1
  .Sh SEE ALSO
  .Xr csh 1 ,
  .Xr ksh 1 ,
  .Xr pkill 1 ,
  .Xr ps 1 ,
  .Xr kill 2 ,
  .Xr signal 3
  .Sh STANDARDS
  The
  .Nm
  utility is compliant with the
  .St -p1003.1-2008
  specification.
  .Pp
  The
  .Fl Ar signal_name
  and
  .Fl Ar signal_number
  syntax is marked by
  .St -p1003.1-2008
  as being an
  X/Open System Interfaces
  option.
  .Pp
  .Nm
  also exists as a built-in to
  .Xr csh 1
  and
  .Xr ksh 1 ,
  though with a different syntax.
  .Sh HISTORY
  A
  .Nm
  command appeared in
  .At v3 .