shell_cmds-198.tar.gz

[apple/shell_cmds.git] / nohup / nohup.1

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.\"	@(#)nohup.1	8.1 (Berkeley) 6/6/93
.\" $FreeBSD: src/usr.bin/nohup/nohup.1,v 1.13 2005/01/17 07:44:27 ru Exp $
.\"
.Dd July 19, 2001
.Dt NOHUP 1
.Os
.Sh NAME
.Nm nohup
.Nd invoke a utility immune to hangups
.Sh SYNOPSIS
.Nm
.Op Fl Fl
.Ar utility
.Op Ar arguments
.Sh DESCRIPTION
The
.Nm
utility invokes
.Ar utility
with its
.Ar arguments
and at this time sets the signal
.Dv SIGHUP
to be ignored.
If the standard output is a terminal, the standard output is
appended to the file
.Pa nohup.out
in the current directory.
If standard error is a terminal, it is directed to the same place
as the standard output.
.Pp
Some shells may provide a builtin
.Nm
command which is similar or identical to this utility.
Consult the
.Xr builtin 1
manual page.
.Sh ENVIRONMENT
The following variables are utilized by
.Nm :
.Bl -tag -width flag
.It Ev HOME
If the output file
.Pa nohup.out
cannot be created in the current directory, the
.Nm
utility uses the directory named by
.Ev HOME
to create the file.
.It Ev PATH
Used to locate the requested
.Ar utility
if the name contains no
.Ql /
characters.
.El
.Sh EXIT STATUS
The
.Nm
utility exits with one of the following values:
.Bl -tag -width Ds
.It 126
The
.Ar utility
was found, but could not be invoked.
.It 127
The
.Ar utility
could not be found or an error occurred in
.Nm .
.El
.Pp
Otherwise, the exit status of
.Nm
will be that of
.Ar utility .
.Sh SEE ALSO
.Xr builtin 1 ,
.Xr csh 1 ,
.Xr signal 3
.Sh STANDARDS
The
.Nm
utility is expected to be
.St -p1003.2
compatible.
.Sh BUGS
Two or more instances of
.Nm
can append to the same file, which makes for a confusing output.