116 lines
3.3 KiB
Groff
116 lines
3.3 KiB
Groff
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.\" $NetBSD: nohup.1,v 1.15 2012/03/29 18:33:19 wiz Exp $
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.\"
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Institute of Electrical and Electronics Engineers, Inc.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)nohup.1 8.1 (Berkeley) 6/6/93
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.\"
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.Dd July 15, 2005
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.Dt NOHUP 1
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.Os
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.Sh NAME
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.Nm nohup
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.Nd invoke a command immune to hangups
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.Sh SYNOPSIS
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.Nm
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.Ar utility
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.Op Ar arg ...
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.Sh DESCRIPTION
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The
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.Nm
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command allows the specified utility to be protected from termination
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if the user should become logged out
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(for example, due to a modem line or TCP/IP connection being dropped).
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To do this,
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.Nm
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sets the
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.Dv SIGHUP
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.Xr signal 3
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.Pq Dq terminal line hangup
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to be ignored,
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then executes
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.Ar utility
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along with any arguments.
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.Pp
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If the standard output is a terminal, the standard output is
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appended to the file
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.Pa nohup.out
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in the current directory.
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If standard error is a terminal, it is directed to the same place
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as the standard output.
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If the output file
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.Pa nohup.out
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cannot be created in the current directory,
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.Nm
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attempts to create the file in the user's home directory.
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If the file
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.Pa nohup.out
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cannot be created,
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either in the current directory or the user's home directory,
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.Nm
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will exit without invoking
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.Ar utility ,
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with an exit value as described below.
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.Sh ENVIRONMENT
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The following variable is used by
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.Nm :
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.Bl -tag -width flag
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.It Ev HOME
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User's home directory.
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.El
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.Sh EXIT STATUS
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The
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.Nm
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utility exits with one of the following values:
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.Bl -tag -width Ds
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.It 126
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The
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.Ar utility
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was found but could not be invoked.
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.It 127
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The
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.Ar utility
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could not be found or an error occurred in
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.Nm .
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.El
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.Pp
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Otherwise, the exit status of
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.Nm
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will be that of
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.Ar utility .
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.Sh SEE ALSO
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.Xr signal 3
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.Sh STANDARDS
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The
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.Nm
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command is expected to be
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.St -p1003.2
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compatible.
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