1.\" $NetBSD: renice.8,v 1.10 2001/12/08 19:11:33 wiz Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)renice.8 8.1 (Berkeley) 6/9/93 35.\" $NetBSD: renice.8,v 1.10 2001/12/08 19:11:33 wiz Exp $ 36.\" 37.Dd June 9, 1993 38.Dt RENICE 8 39.Os 40.Sh NAME 41.Nm renice 42.Nd alter priority of running processes 43.Sh SYNOPSIS 44.Nm 45.Ar priority 46.Oo 47.Op Fl p 48.Ar pid ... 49.Oc 50.Oo 51.Fl g 52.Ar pgrp ... 53.Oc 54.Oo 55.Fl u 56.Ar user ... 57.Oc 58.Nm "" 59.Fl n 60.Ar increment 61.Oo 62.Op Fl p 63.Ar pid ... 64.Oc 65.Oo 66.Fl g 67.Ar pgrp ... 68.Oc 69.Oo 70.Fl u 71.Ar user ... 72.Oc 73.Sh DESCRIPTION 74.Nm 75alters the 76scheduling priority of one or more running processes. 77The following 78.Ar who 79parameters are interpreted as process ID's, process group 80ID's, or user names. 81.Nm "" Ns 'ing 82a process group causes all processes in the process group 83to have their scheduling priority altered. 84.Nm "" Ns 'ing 85a user causes all processes owned by the user to have 86their scheduling priority altered. 87By default, the processes to be affected are specified by 88their process ID's. 89.Pp 90Options supported by 91.Nm "" : 92.Bl -tag -width Ds 93.It Fl g 94Force 95.Ar who 96parameters to be interpreted as process group ID's. 97.It Fl n 98Instead of changing the specified processes to the given priority, 99interpret the following argument as an increment to be applied to 100the current priority of each process. 101.It Fl u 102Force the 103.Ar who 104parameters to be interpreted as user names. 105.It Fl p 106Resets the 107.Ar who 108interpretation to be (the default) process ID's. 109.El 110.Pp 111For example, 112.Bd -literal -offset 113renice +1 987 -u daemon root -p 32 114.Ed 115.Pp 116would change the priority of process ID's 987 and 32, and 117all processes owned by users daemon and root. 118.Pp 119Users other than the super-user may only alter the priority of 120processes they own, 121and can only monotonically increase their ``nice value'' 122within the range 0 to 123.Dv PRIO_MAX 124(20). 125(This prevents overriding administrative fiats.) 126The super-user 127may alter the priority of any process 128and set the priority to any value in the range 129.Dv PRIO_MIN 130(\-20) 131to 132.Dv PRIO_MAX . 133.Pp 134Useful priorities are: 1350, the ``base'' scheduling priority; 13620, the affected processes will run only when nothing at the base priority 137wants to; 138anything negative, the processes will receive a scheduling preference. 139.Sh FILES 140.Bl -tag -width /etc/passwd -compact 141.It Pa /etc/passwd 142to map user names to user ID's 143.El 144.Sh SEE ALSO 145.Xr nice 1 , 146.Xr getpriority 2 , 147.Xr setpriority 2 148.Sh HISTORY 149The 150.Nm 151command appeared in 152.Bx 4.0 . 153.Sh BUGS 154Non super-users can not increase scheduling priorities of their own processes, 155even if they were the ones that decreased the priorities in the first place. 156