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e896ec1ef5
- Don't assume environment variable HOME is not NULL.
o Integrate standards compliance from NetBSD.
- Allow -- before the command.
- Blocking SIGQUIT isn't standards compliant.
- Proper exit(3) levels.
- Actually append to nohup.out (as documented and required
by standard) instead of clobbering it.
o Remove some FreeBSD specific access(2) cruft (relating to
incorrect appending).
o Document the fact that two or more instances of nohup can
append to the same file.
o Constify; Staticize functions; Set WARNS?=2
Reviewed by: bde
Approved by: des
Obtained from: NetBSD, OpenBSD
MFC after: 9 days
119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" $FreeBSD$
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.\"
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.Dd June 6, 1993
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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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.Op Ar --
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.Ar command
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.Op Ar arguments
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.Sh DESCRIPTION
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The
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.Nm
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utility invokes
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.Ar command
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with its
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.Ar arguments
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and at this time sets the signal
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.Dv SIGHUP
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to be ignored.
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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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.Pp
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Some shells may provide a builtin
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.Nm
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command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Sh ENVIRONMENT
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The following variable is utilized 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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If the output file
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.Pa nohup.out
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cannot be created in the current directory, the
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.Nm
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utility uses the directory named by
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.Ev HOME
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to create the file.
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.El
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.Sh DIAGNOSTICS
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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 command
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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 command
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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 command .
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.Sh SEE ALSO
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.Xr builtin 1 ,
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.Xr csh 1 ,
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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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utility is expected to be
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.St -p1003.2
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compatible.
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.Sh BUGS
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Two or more instances of
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.Nm
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can append to the same file, which makes for a confusing output.
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