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.\" $FreeBSD$ 37.\" 38.Dd June 6, 1993 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.Ar command 47.Op Ar arg ... 48.Sh DESCRIPTION 49The 50.Nm 51utility invokes 52.Ar command 53with 54its arguments 55and at this time sets the signal 56.Dv SIGHUP 57to be ignored. 58The signal 59.Dv SIGQUIT 60may also be set 61to be ignored. 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. 68.Pp 69.Nm Nohup 70exits 1 if an error occurs, otherwise the exit status is that of 71.Ar command . 72.Pp 73Some shells may provide a builtin 74.Nm 75command which is similar or identical to this utility. 76Consult the 77.Xr builtin 1 78manual page. 79.Sh ENVIRONMENT 80The following variable is utilized by 81.Nm nohup . 82.Bl -tag -width flag 83.It Ev HOME 84If the output file 85.Pa nohup.out 86cannot be created in the current directory, the 87.Nm 88utility uses the directory named by 89.Ev HOME 90to create the file. 91.El 92.Sh SEE ALSO 93.Xr builtin 1 , 94.Xr csh 1 , 95.Xr signal 3 96.Sh STANDARDS 97The 98.Nm 99utility is expected to be 100.St -p1003.2 101compatible. 102