1.\" $NetBSD: nohup.1,v 1.14 2010/05/14 17:28:56 joerg Exp $ 2.\" 3.\" Copyright (c) 1989, 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.\" @(#)nohup.1 8.1 (Berkeley) 6/6/93 34.\" 35.Dd July 15, 2005 36.Dt NOHUP 1 37.Os 38.Sh NAME 39.Nm nohup 40.Nd invoke a command immune to hangups 41.Sh SYNOPSIS 42.Nm 43.Ar utility 44.Op Ar arg ... 45.Sh DESCRIPTION 46The 47.Nm 48command allows the specified utility to be protected from termination 49if the user should become logged out 50(for example, due to a modem line or TCP/IP connection being dropped). 51To do this, 52.Nm 53sets the 54.Dv SIGHUP 55.Xr signal 3 56.Pq Dq terminal line hangup 57to be ignored, 58then executes 59.Ar utility 60along with any arguments. 61.Pp 62If the standard output is a terminal, the standard output is 63appended to the file 64.Pa nohup.out 65in the current directory. 66If standard error is a terminal, it is directed to the same place 67as the standard output. 68If the output file 69.Pa nohup.out 70cannot be created in the current directory, 71.Nm 72attempts to create the file in the user's home directory. 73If the file 74.Pa nohup.out 75cannot be created, 76either in the current directory or the user's home directory, 77.Nm 78will exit without invoking 79.Ar utility , 80with an exit value as described below. 81.Sh ENVIRONMENT 82The following variable is used by 83.Nm . 84.Bl -tag -width flag 85.It Ev HOME 86User's home directory. 87.El 88.Sh EXIT STATUS 89The 90.Nm 91utility exits with one of the following values: 92.Bl -tag -width Ds 93.It 126 94The 95.Ar utility 96was found but could not be invoked. 97.It 127 98The 99.Ar utility 100could not be found or an error occurred in 101.Nm . 102.El 103.Pp 104Otherwise, the exit status of 105.Nm 106will be that of 107.Ar utility . 108.Sh SEE ALSO 109.Xr signal 3 110.Sh STANDARDS 111The 112.Nm 113command is expected to be 114.St -p1003.2 115compatible. 116