man > renice(1)

RENICE(1)                                   User Commands                                  RENICE(1)

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.

       -h, --help
           Display help text and exit.

       -V, --version
           Print version and exit.

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)

REPORTING BUGS
       For bug reports, use the issue tracker at https://github.com/util-linux/util-linux/issues.

AVAILABILITY
       The renice command is part of the util-linux package which can be downloaded from Linux
       Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.39.3                            2023-11-21                                    RENICE(1)