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.Dd June 26, 2023 32.Dt NOHUP 1 33.Os 34.Sh NAME 35.Nm nohup 36.Nd invoke a utility immune to hangups 37.Sh SYNOPSIS 38.Nm 39.Op Fl Fl 40.Ar utility 41.Op Ar arguments 42.Sh DESCRIPTION 43The 44.Nm 45utility invokes 46.Ar utility 47with its 48.Ar arguments 49and at this time sets the signal 50.Dv SIGHUP 51to be ignored. 52If the standard output is a terminal, the standard output is 53appended to the file 54.Pa nohup.out 55in the current directory. 56If standard error is a terminal, it is directed to the same place 57as the standard output. 58.Pp 59Some shells may provide a builtin 60.Nm 61command which is similar or identical to this utility. 62Consult the 63.Xr builtin 1 64manual page. 65.Sh ENVIRONMENT 66The following variables are utilized by 67.Nm : 68.Bl -tag -width flag 69.It Ev HOME 70If the output file 71.Pa nohup.out 72cannot be created in the current directory, the 73.Nm 74utility uses the directory named by 75.Ev HOME 76to create the file. 77.It Ev PATH 78Used to locate the requested 79.Ar utility 80if the name contains no 81.Ql / 82characters. 83.El 84.Sh EXIT STATUS 85The 86.Nm 87utility exits with one of the following values: 88.Bl -tag -width Ds 89.It 126 90The 91.Ar utility 92was found, but could not be invoked. 93.It 127 94The 95.Ar utility 96could not be found or an error occurred in 97.Nm . 98.El 99.Pp 100Otherwise, the exit status of 101.Nm 102will be that of 103.Ar utility . 104.Sh SEE ALSO 105.Xr builtin 1 , 106.Xr csh 1 , 107.Xr timeout 1 , 108.Xr signal 3 , 109.Xr daemon 8 110.Sh STANDARDS 111The 112.Nm 113utility is expected to be 114.St -p1003.2 115compatible. 116.Sh BUGS 117Two or more instances of 118.Nm 119can append to the same file, which makes for a confusing output. 120