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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)nohup.1 8.1 (Berkeley) 6/6/93 32.\" 33.Dd June 26, 2023 34.Dt NOHUP 1 35.Os 36.Sh NAME 37.Nm nohup 38.Nd invoke a utility immune to hangups 39.Sh SYNOPSIS 40.Nm 41.Op Fl Fl 42.Ar utility 43.Op Ar arguments 44.Sh DESCRIPTION 45The 46.Nm 47utility invokes 48.Ar utility 49with its 50.Ar arguments 51and at this time sets the signal 52.Dv SIGHUP 53to be ignored. 54If the standard output is a terminal, the standard output is 55appended to the file 56.Pa nohup.out 57in the current directory. 58If standard error is a terminal, it is directed to the same place 59as the standard output. 60.Pp 61Some shells may provide a builtin 62.Nm 63command which is similar or identical to this utility. 64Consult the 65.Xr builtin 1 66manual page. 67.Sh ENVIRONMENT 68The following variables are utilized by 69.Nm : 70.Bl -tag -width flag 71.It Ev HOME 72If the output file 73.Pa nohup.out 74cannot be created in the current directory, the 75.Nm 76utility uses the directory named by 77.Ev HOME 78to create the file. 79.It Ev PATH 80Used to locate the requested 81.Ar utility 82if the name contains no 83.Ql / 84characters. 85.El 86.Sh EXIT STATUS 87The 88.Nm 89utility exits with one of the following values: 90.Bl -tag -width Ds 91.It 126 92The 93.Ar utility 94was found, but could not be invoked. 95.It 127 96The 97.Ar utility 98could not be found or an error occurred in 99.Nm . 100.El 101.Pp 102Otherwise, the exit status of 103.Nm 104will be that of 105.Ar utility . 106.Sh SEE ALSO 107.Xr builtin 1 , 108.Xr csh 1 , 109.Xr timeout 1 , 110.Xr signal 3 , 111.Xr daemon 8 112.Sh STANDARDS 113The 114.Nm 115utility is expected to be 116.St -p1003.2 117compatible. 118.Sh BUGS 119Two or more instances of 120.Nm 121can append to the same file, which makes for a confusing output. 122