renice is a *NIX command used to change the priority of a particular process, group of processes, or user. Its parameters:
 /usr/bin/renice [ -n increment | priority ] [ [ -p ] pid ... ]
	  [ [ -g ] pgrp ... ] [ [ -u ] user ... ]
-n is followed by a positive or negative integer indicating the change in scheduling priority. Alternately, the priority can be explicitly defined.
-p is used to specify that the parameters of the command should be interpreted as a pid
-g specifies instead that the parameters be read as a group of processes.
-u means that the the changes should be exacted on a user.

Only superusers are able to renice all processes, other users can only change the priority of processes belonging to them and only within a certain range so as not to override administrative processes.

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