1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)renice.8 8.1 (Berkeley) 6/9/93 33.\" $FreeBSD$ 34.\" 35.Dd June 9, 1993 36.Dt RENICE 8 37.Os 38.Sh NAME 39.Nm renice 40.Nd alter priority of running processes 41.Sh SYNOPSIS 42.Nm 43.Op Ar priority | Op Fl n Ar increment 44.Op Oo Fl p Oc Ar pid ... 45.Op Oo Fl g Oc Ar pgrp ... 46.Op Oo Fl u Oc Ar user ... 47.Sh DESCRIPTION 48.Nm Renice 49alters the 50scheduling priority of one or more running processes. 51The following 52.Ar who 53parameters are interpreted as process ID's, process group 54ID's, user ID's or user names. 55.Nm Renice Ns 'ing 56a process group causes all processes in the process group 57to have their scheduling priority altered. 58.Nm Renice Ns 'ing 59a user causes all processes owned by the user to have 60their scheduling priority altered. 61By default, the processes to be affected are specified by 62their process ID's. 63.Pp 64Options supported by 65.Nm : 66.Bl -tag -width Ds 67.It Fl g 68Force 69.Ar who 70parameters to be interpreted as process group ID's. 71.It Fl n 72Instead of changing the specified processes to the given priority, 73interpret the following argument as an increment to be applied to 74the current priority of each process. 75.It Fl u 76Force the 77.Ar who 78parameters to be interpreted as user names or user ID's. 79.It Fl p 80Resets the 81.Ar who 82interpretation to be (the default) process ID's. 83.El 84.Pp 85For example, 86.Pp 87.Dl "renice +1 987 -u daemon root -p 32" 88.Pp 89would change the priority of process ID's 987 and 32, and 90all processes owned by users daemon and root. 91.Pp 92Users other than the super-user may only alter the priority of 93processes they own, 94and can only monotonically increase their ``nice value'' 95within the range 0 to 96.Dv PRIO_MAX 97(20). 98(This prevents overriding administrative fiats.) 99The super-user 100may alter the priority of any process 101and set the priority to any value in the range 102.Dv PRIO_MIN 103(\-20) 104to 105.Dv PRIO_MAX . 106Useful priorities are: 10720 (the affected processes will run only when nothing else 108in the system wants to), 1090 (the ``base'' scheduling priority), 110anything negative (to make things go very fast). 111.Sh FILES 112.Bl -tag -width /etc/passwd -compact 113.It Pa /etc/passwd 114to map user names to user ID's 115.El 116.Sh SEE ALSO 117.Xr nice 1 , 118.Xr rtprio 1 , 119.Xr getpriority 2 , 120.Xr setpriority 2 121.Sh STANDARDS 122The 123.Nm 124utility conforms to 125.St -p1003.1-2001 . 126.Sh HISTORY 127The 128.Nm 129command appeared in 130.Bx 4.0 . 131.Sh BUGS 132Non super-users cannot increase scheduling priorities of their own processes, 133even if they were the ones that decreased the priorities in the first place. 134