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//po4a: entry man manual
////
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. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. 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.
@(#)renice.8 8.1 (Berkeley) 6/9/93
////
= renice(1)
:doctype: manpage
:man manual: User Commands
:man source: util-linux {release-version}
:page-layout: base
:command: renice
== NAME
renice - alter priority of running processes
== SYNOPSIS
*renice* [*--priority|--relative*] _priority_ [*-g*|*-p*|*-u*] _identifier_...
== DESCRIPTION
*renice* alters the scheduling priority of one or more running processes. The first argument is the _priority_ value to be used. The other arguments are interpreted as process IDs (by default), process group IDs, user IDs, or user names. *renice*'ing a process group causes all processes in the process group to have their scheduling priority altered. *renice*'ing a user causes all processes owned by the user to have their scheduling priority altered.
If no *-n*, *--priority* or *--relative* option is used, then the priority is set as *absolute*.
== OPTIONS
*-n* _priority_::
Specify the *absolute* or *relative* (depending on environment variable POSIXLY_CORRECT) scheduling _priority_ to be used for the process, process group, or user. Use of the option *-n* is optional, but when used, it must be the first argument. See *NOTES* for more information.
*--priority* _priority_::
Specify an *absolute* scheduling _priority_. _Priority_ is set to the given value. This is the default, when no option is specified.
*--relative* _priority_::
Specify a *relative* scheduling _priority_. Same as the standard POSIX *-n* option. _Priority_ gets _incremented/decremented_ by the given value.
*-g*, *--pgrp*::
Interpret the succeeding arguments as process group IDs.
*-p*, *--pid*::
Interpret the succeeding arguments as process IDs (the default).
*-u*, *--user*::
Interpret the succeeding arguments as usernames or UIDs.
include::man-common/help-version.adoc[]
== FILES
_/etc/passwd_::
to map user names to user IDs
== NOTES
Users other than the superuser may only alter the priority of processes they own. Furthermore, an unprivileged user can only _increase_ the "nice value" (i.e., choose a lower priority) and such changes are irreversible unless (since Linux 2.6.12) the user has a suitable "nice" resource limit (see *ulimit*(1p) and *getrlimit*(2)).
The superuser may alter the priority of any process and set the priority to any value in the range -20 to 19. Useful priorities are: 19 (the affected processes will run only when nothing else in the system wants to), 0 (the "base" scheduling priority), anything negative (to make things go very fast).
For historical reasons in this implementation, the *-n* option did not follow the POSIX specification. Therefore, instead of setting a *relative* priority, it sets an *absolute* priority by default. As this may not be desirable, this behavior can be controlled by setting the environment variable POSIXLY_CORRECT to be fully POSIX compliant. See the *-n* option for details. See *--relative* and *--priority* for options that do not change behavior depending on environment variables.
== HISTORY
The *renice* command appeared in 4.0BSD.
== EXAMPLES
The following command would change the priority of the processes with PIDs 987 and 32, plus all processes owned by the users daemon and root:
*renice +1 987 -u daemon root -p 32*
== SEE ALSO
*nice*(1),
*chrt*(1),
*getpriority*(2),
*setpriority*(2),
*credentials*(7),
*sched*(7)
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