Merge branch 'patch-23' of https://github.com/mariobl/util-linux

[thirdparty/util-linux.git] / sys-utils / renice.1.adoc

//po4a: entry man manual
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    @(#)renice.8	8.1 (Berkeley) 6/9/93
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= 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.

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== 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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