119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" Copyright (c) 1980, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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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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.\" @(#)nice.1 8.1 (Berkeley) 6/6/93
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.\" $Id$
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.\"
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.Dd June 6, 1993
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.Dt NICE 1
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.Os BSD 4
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.Sh NAME
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.Nm nice
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.Nd execute a command at a low scheduling priority
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.Sh SYNOPSIS
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.Nm nice
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.Op Fl Ns Ar number
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.Ar command
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.Op Ar arguments
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.Sh DESCRIPTION
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.Nm Nice
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runs
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.Ar command
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at a low priority.
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(Think of low and slow).
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If
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.Fl Ns Ar number
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is not given
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.Nm
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assumed the value 10.
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The priority is a value in the range -20 to 20. The default priority
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is 0, priority 20 is the lowest possible.
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.Nm Nice
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will execute
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.Ar command
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at priority
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.Ar number
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relative to the priority
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of
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.Nm nice .
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Higher priorities than the
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current process priority can only requested by the
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super-user.
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Negative numbers are expressed as
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.Fl - Ns Ar number .
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.Pp
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The returned exit status is the exit value from the
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command executed by
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.Nm nice .
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.Sh EXAMPLES
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.Pp
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$ nice -5 date
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.Pp
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Execute command
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.Sq date
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at priority 5 assuming the priority of the
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shell is 0.
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.Pp
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# nice -16 nice --35 date
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.Pp
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Execute command
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.Sq date
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at priority -19 assuming the priority of the
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shell is 0 and you are the super-user.
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.Sh SEE ALSO
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.Xr csh 1 ,
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.Xr getpriority 2 ,
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.Xr setpriority 2 ,
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.Xr renice 8
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.Sh HISTORY
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A
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.Nm nice
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command appeared in
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.At v6 .
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.Sh BUGS
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.Nm Nice
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is particular to
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.Xr sh 1 .
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If you use
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.Xr csh 1 ,
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then commands executed with ``&'' are automatically immune to hangup
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signals while in the background.
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.Pp
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.Nm Nice
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is built into
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.Xr csh 1
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with a slightly different syntax than described here. The form
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.Ql nice +10
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nices to positive nice, and
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.Ql nice \-10
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can be used
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by the super-user to give a process more of the processor.
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