renice - alter priority of running processes
renice [-n] priority [-g|-p|-u]
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
-n, --priority priority
Specify the scheduling priority to be used for the
process, process group, or user. Use of the option -n or
--priority is optional, but when used it must be the first
Interpret the succeeding arguments as process group
Interpret the succeeding arguments as process IDs (the
Interpret the succeeding arguments as usernames or
Display version information and exit.
Display help text and exit.
to map user names to user IDs
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).
The renice command appeared in 4.0BSD.
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