121 lines
3.5 KiB
Groff
121 lines
3.5 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
|
|
.\" $Id: nice.1,v 1.7 1998/03/23 07:45:40 charnier Exp $
|
|
.\"
|
|
.Dd June 6, 1993
|
|
.Dt NICE 1
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm nice
|
|
.Nd execute a command at a low scheduling priority
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl Ns Ar number
|
|
.Ar command
|
|
.Op Ar arguments
|
|
.Sh DESCRIPTION
|
|
.Nm Nice
|
|
runs
|
|
.Ar command
|
|
at a low priority.
|
|
(Think of low and slow).
|
|
If
|
|
.Fl Ns Ar number
|
|
is not given
|
|
.Nm
|
|
assumed the value 10.
|
|
The priority is a value in the range -20 to 20. The default priority
|
|
is 0, priority 20 is the lowest possible.
|
|
.Nm Nice
|
|
will execute
|
|
.Ar command
|
|
at priority
|
|
.Ar number
|
|
relative to the priority
|
|
of
|
|
.Nm nice .
|
|
Higher priorities than the
|
|
current process priority can only requested by the
|
|
super-user.
|
|
Negative numbers are expressed as
|
|
.Fl - Ns Ar number .
|
|
.Pp
|
|
The returned exit status is the exit value from the
|
|
command executed by
|
|
.Nm nice .
|
|
.Sh EXAMPLES
|
|
.Pp
|
|
$ nice -5 date
|
|
.Pp
|
|
Execute command
|
|
.Sq date
|
|
at priority 5 assuming the priority of the
|
|
shell is 0.
|
|
.Pp
|
|
# nice -16 nice --35 date
|
|
.Pp
|
|
Execute command
|
|
.Sq date
|
|
at priority -19 assuming the priority of the
|
|
shell is 0 and you are the super-user.
|
|
.Sh SEE ALSO
|
|
.Xr csh 1 ,
|
|
.Xr idprio 1 ,
|
|
.Xr getpriority 2 ,
|
|
.Xr setpriority 2 ,
|
|
.Xr renice 8 ,
|
|
.Xr rtprio 1
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
command appeared in
|
|
.At v6 .
|
|
.Sh BUGS
|
|
.Nm Nice
|
|
is particular to
|
|
.Xr sh 1 .
|
|
If you use
|
|
.Xr csh 1 ,
|
|
then commands executed with ``&'' are automatically immune to hangup
|
|
signals while in the background.
|
|
.Pp
|
|
.Nm Nice
|
|
is built into
|
|
.Xr csh 1
|
|
with a slightly different syntax than described here. The form
|
|
.Ql nice +10
|
|
nices to positive nice, and
|
|
.Ql nice \-10
|
|
can be used
|
|
by the super-user to give a process more of the processor.
|