freebsd-dev/usr.bin/nice/nice.1

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.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
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.\" notice, this list of conditions and the following disclaimer in the
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.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
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.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
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.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
.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
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.Nm
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.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
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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.
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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 .
.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 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.
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.Sh SEE ALSO
.Xr builtin 1 ,
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.Xr csh 1 ,
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.Xr idprio 1 ,
.Xr rtprio 1 ,
.Xr getpriority 2 ,
.Xr setpriority 2 ,
.Xr renice 8
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.Sh HISTORY
A
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.Nm
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command appeared in
.At v6 .