1.\" $NetBSD: wait.1,v 1.5 2017/07/03 21:30:58 wiz Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)wait.1 8.1 (Berkeley) 6/5/93 31.\" 32.Dd June 5, 1993 33.Dt WAIT 1 34.Os 35.Sh NAME 36.Nm wait 37.Nd await process completion 38.Sh SYNOPSIS 39.Nm wait 40.Op Ar pid 41.Sh DESCRIPTION 42If invoked with no arguments, the 43.Nm wait 44utility waits until 45all existing child processes in the background 46have terminated. 47.Pp 48Available operands: 49.Bl -tag -width Ds 50.It Ar pid 51If a 52.Ar pid 53operand is specified, and it is the process ID of a 54background child process that still exists, the 55.Nm wait 56utility 57waits until that process has completed and consumes its 58status information, without consuming the status information 59of any other process. 60.Pp 61If a pid operand is specified that is not the process ID of 62a child background process that still exists, 63.Nm wait 64exits 65without waiting for any processes to complete. 66.El 67.Pp 68The 69.Nm wait 70utility exits with one of the following values: 71.Bl -tag -width Ds 72.It \&0 73The 74.Nm wait 75utility was invoked with no operands and 76all of the existing background child processes have 77terminated, or the process specified by the pid 78operand exited normally with 0 as its exit status. 79.It \&>\&0 80The specified process did not exist and its exit 81status information was not available, or the specified 82process existed or its exit status information 83was available, and it terminated with a non-zero 84exit status. 85.El 86.Pp 87If the specified process terminated abnormally due 88to the receipt of a signal, the exit status 89information of 90.Nm wait 91contains that termination status as 92well. 93.Sh STANDARDS 94The 95.Nm wait 96command is expected to be 97.St -p1003.2 98compatible. 99