nohup/nohup.1

   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 1.13 2005/01/17 07:44:27 ru Exp $
  37 .\"
  38 .Dd July 19, 2001
  39 .Dt NOHUP 1
  40 .Os
  41 .Sh NAME
  42 .Nm nohup
  43 .Nd invoke a utility immune to hangups
  44 .Sh SYNOPSIS
  45 .Nm
  46 .Op Fl Fl
  47 .Ar utility
  48 .Op Ar arguments
  49 .Sh DESCRIPTION
  50 The
  51 .Nm
  52 utility invokes
  53 .Ar utility
  54 with its
  55 .Ar arguments
  56 and at this time sets the signal
  57 .Dv SIGHUP
  58 to be ignored.
  59 If the standard output is a terminal, the standard output is
  60 appended to the file
  61 .Pa nohup.out
  62 in the current directory.
  63 If standard error is a terminal, it is directed to the same place
  64 as the standard output.
  65 .Pp
  66 Some shells may provide a builtin
  67 .Nm
  68 command which is similar or identical to this utility.
  69 Consult the
  70 .Xr builtin 1
  71 manual page.
  72 .Sh ENVIRONMENT
  73 The following variables are utilized by
  74 .Nm :
  75 .Bl -tag -width flag
  76 .It Ev HOME
  77 If the output file
  78 .Pa nohup.out
  79 cannot be created in the current directory, the
  80 .Nm
  81 utility uses the directory named by
  82 .Ev HOME
  83 to create the file.
  84 .It Ev PATH
  85 Used to locate the requested
  86 .Ar utility
  87 if the name contains no
  88 .Ql /
  89 characters.
  90 .El
  91 .Sh EXIT STATUS
  92 The
  93 .Nm
  94 utility exits with one of the following values:
  95 .Bl -tag -width Ds
  96 .It 126
  97 The
  98 .Ar utility
  99 was found, but could not be invoked.
 100 .It 127
 101 The
 102 .Ar utility
 103 could not be found or an error occurred in
 104 .Nm .
 105 .El
 106 .Pp
 107 Otherwise, the exit status of
 108 .Nm
 109 will be that of
 110 .Ar utility .
 111 .Sh SEE ALSO
 112 .Xr builtin 1 ,
 113 .Xr csh 1 ,
 114 .Xr signal 3
 115 .Sh STANDARDS
 116 The
 117 .Nm
 118 utility is expected to be
 119 .St -p1003.2
 120 compatible.
 121 .Sh BUGS
 122 Two or more instances of
 123 .Nm
 124 can append to the same file, which makes for a confusing output.