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.Ar priority 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.Nm 48.Fl n Ar increment 49.Op Oo Fl p Oc Ar pid ... 50.Op Oo Fl g Oc Ar pgrp ... 51.Op Oo Fl u Oc Ar user ... 52.Sh DESCRIPTION 53The 54.Nm 55utility alters the 56scheduling priority of one or more running processes. 57The following 58.Ar who 59parameters are interpreted as process ID's, process group 60ID's, user ID's or user names. 61The 62.Nm Ns 'ing 63of a process group causes all processes in the process group 64to have their scheduling priority altered. 65The 66.Nm Ns 'ing 67of a user causes all processes owned by the user to have 68their scheduling priority altered. 69By default, the processes to be affected are specified by 70their process ID's. 71.Pp 72The following options are available: 73.Bl -tag -width indent 74.It Fl g 75Force 76.Ar who 77parameters to be interpreted as process group ID's. 78.It Fl n 79Instead of changing the specified processes to the given priority, 80interpret the following argument as an increment to be applied to 81the current priority of each process. 82.It Fl u 83Force the 84.Ar who 85parameters to be interpreted as user names or user ID's. 86.It Fl p 87Reset the 88.Ar who 89interpretation to be (the default) process ID's. 90.El 91.Pp 92For example, 93.Pp 94.Dl "renice +1 987 -u daemon root -p 32" 95.Pp 96would change the priority of process ID's 987 and 32, and 97all processes owned by users daemon and root. 98.Pp 99Users other than the super-user may only alter the priority of 100processes they own, 101and can only monotonically increase their ``nice value'' 102within the range 0 to 103.Dv PRIO_MAX 104(20). 105(This prevents overriding administrative fiats.) 106The super-user 107may alter the priority of any process 108and set the priority to any value in the range 109.Dv PRIO_MIN 110(\-20) 111to 112.Dv PRIO_MAX . 113Useful priorities are: 11420 (the affected processes will run only when nothing else 115in the system wants to), 1160 (the ``base'' scheduling priority), 117anything negative (to make things go very fast). 118.Sh FILES 119.Bl -tag -width /etc/passwd -compact 120.It Pa /etc/passwd 121to map user names to user ID's 122.El 123.Sh SEE ALSO 124.Xr nice 1 , 125.Xr rtprio 1 , 126.Xr getpriority 2 , 127.Xr setpriority 2 128.Sh STANDARDS 129The 130.Nm 131utility conforms to 132.St -p1003.1-2001 . 133.Sh HISTORY 134The 135.Nm 136utility appeared in 137.Bx 4.0 . 138.Sh BUGS 139Non super-users cannot increase scheduling priorities of their own processes, 140even if they were the ones that decreased the priorities in the first place. 141