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+.\"	$NetBSD: renice.8,v 1.15 2012/12/06 07:52:12 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 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. 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.
+.\"
+.\"     from: @(#)renice.8	8.1 (Berkeley) 6/9/93
+.\"
+.Dd December 6, 2012
+.Dt RENICE 8
+.Os
+.Sh NAME
+.Nm renice
+.Nd alter priority of running processes
+.Sh SYNOPSIS
+.Nm
+.Ar priority
+.Oo
+.Op Fl p
+.Ar pid ...
+.Oc
+.Oo
+.Fl g
+.Ar pgrp ...
+.Oc
+.Oo
+.Fl u
+.Ar user ...
+.Oc
+.Nm
+.Fl n
+.Ar increment
+.Oo
+.Op Fl p
+.Ar pid ...
+.Oc
+.Oo
+.Fl g
+.Ar pgrp ...
+.Oc
+.Oo
+.Fl u
+.Ar user ...
+.Oc
+.Sh DESCRIPTION
+.Nm
+alters the
+scheduling priority of one or more running processes.
+The following
+.Ar who
+parameters are interpreted as process ID's, process group
+ID's, or user names.
+.Nm Ns 'ing
+a process group causes all processes in the process group
+to have their scheduling priority altered.
+.Nm Ns 'ing
+a user causes all processes owned by the user to have
+their scheduling priority altered.
+By default, the processes to be affected are specified by
+their process ID's.
+.Pp
+Options supported by
+.Nm :
+.Bl -tag -width Ds
+.It Fl g
+Force
+.Ar who
+parameters to be interpreted as process group ID's.
+.It Fl n
+Instead of changing the specified processes to the given priority,
+interpret the following argument as an increment to be applied to
+the current priority of each process.
+.It Fl u
+Force the
+.Ar who
+parameters to be interpreted as user names.
+.It Fl p
+Resets the
+.Ar who
+interpretation to be (the default) process ID's.
+.El
+.Pp
+For example,
+.Bd -literal -offset indent
+renice +1 987 -u daemon root -p 32
+.Ed
+.Pp
+would change the priority of process ID's 987 and 32, and
+all processes owned by users daemon and root.
+.Pp
+Users other than the super-user may only alter the priority of
+processes they own,
+and can only monotonically increase their ``nice value''
+within the range 0 to
+.Dv PRIO_MAX
+(20).
+(This prevents overriding administrative fiats.)
+The super-user
+may alter the priority of any process
+and set the priority to any value in the range
+.Dv PRIO_MIN
+(\-20)
+to
+.Dv PRIO_MAX .
+.Pp
+Useful priorities are:
+0, the ``base'' scheduling priority;
+20, the affected processes will run only when nothing at the base priority
+wants to;
+anything negative, the processes will receive a scheduling preference.
+.Sh FILES
+.Bl -tag -width /etc/passwd -compact
+.It Pa /etc/passwd
+to map user names to user ID's
+.El
+.Sh SEE ALSO
+.Xr nice 1 ,
+.Xr prenice 1 ,
+.Xr getpriority 2 ,
+.Xr setpriority 2
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.0 .
+.Sh BUGS
+Non super-users can not increase scheduling priorities of their own processes,
+even if they were the ones that decreased the priorities in the first place.