1.\" Copyright (c) 1989, 1990, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Institute of Electrical and Electronics Engineers, Inc. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)nohup.1 8.1 (Berkeley) 6/6/93 36.\" $FreeBSD: src/usr.bin/nohup/nohup.1,v 1.6.2.4 2001/08/16 13:16:59 ru Exp $ 37.\" 38.Dd April 10, 2013 39.Dt NOHUP 1 40.Os 41.Sh NAME 42.Nm nohup 43.Nd invoke a command immune to hangups 44.Sh SYNOPSIS 45.Nm 46.Op Fl Fl 47.Ar command 48.Op Ar arguments 49.Sh DESCRIPTION 50The 51.Nm 52utility invokes 53.Ar command 54with its 55.Ar arguments 56and at this time sets the signal 57.Dv SIGHUP 58to be ignored. 59If the standard output is a terminal, the standard output is 60appended to the file 61.Pa nohup.out 62in the current directory. 63If standard error is a terminal, it is directed to the same place 64as the standard output. 65.Pp 66Some shells may provide a builtin 67.Nm 68command which is similar or identical to this utility. 69Consult the 70.Xr builtin 1 71manual page. 72.Sh ENVIRONMENT 73The following variable is utilized by 74.Nm : 75.Bl -tag -width flag 76.It Ev HOME 77If the output file 78.Pa nohup.out 79cannot be created in the current directory, the 80.Nm 81utility uses the directory named by 82.Ev HOME 83to create the file. 84.El 85.Sh EXIT STATUS 86The 87.Nm 88utility exits with one of the following values: 89.Bl -tag -width Ds 90.It 126 91The 92.Ar command 93was found, but could not be invoked. 94.It 127 95The 96.Ar command 97could not be found or an error occurred in 98.Nm . 99.El 100.Pp 101Otherwise, the exit status of 102.Nm 103will be that of 104.Ar command . 105.Sh SEE ALSO 106.Xr builtin 1 , 107.Xr csh 1 , 108.Xr signal 3 109.Sh STANDARDS 110The 111.Nm 112utility is expected to be 113.St -p1003.2 114compatible. 115.Sh BUGS 116Two or more instances of 117.Nm 118can append to the same file, which makes for a confusing output. 119