/usr/sbin/renice [-n increment] [-p] [-g | -u] ID ...
/usr/sbin/renice priority [-p] pid ... [-g pgrp ...] [-u user ...]
Interfaces documented on this reference page conform to industry standards as follows:
renice: XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
The value specified is taken as the actual system scheduling priority, rather than as an increment to the existing system scheduling priority. The value may be any integer from -20 to 20, including 0 as explained in the DESCRIPTION section. [Digital] A user name or user ID. All processes with a set_user_ID equal to the specified value are affected. [Digital] A process group ID. All processes in the process group are affected. [Digital] A process ID. Only this process is affected. A value interpreted as a user name, user ID, a process group ID, or a process ID, depending on the flag specified. If no flags are specified, the value is interpreted as a process ID.
The renice command alters the scheduling priority of one or more running processes. The arguments are interpreted as process IDs, process group IDs, or user names. When you issue the renice command with the -g flag, all processes in the process group have their scheduling priority altered. When you run the renice command with the -u flag, all processes owned by the user have their scheduling priority altered. By default, the processes affected are specified by their process IDs.
Only root can alter the priority of other user's processes and can set the priority to any value in the range from -20 to 20. Users without root privileges are restricted to altering the priority of processes they own and can only increase their "nice value" within the range of 0 to 20.
The following priorities are particularly useful: Runs affected processes when no other processes are running on the system. Runs at the base scheduling priority. Runs affected processes very quickly.
[Digital] The preceding values are mapped by the command to those actually used by the kernel.
[Digital] Users who do not have root privileges cannot increase the scheduling priorities of their own processes (even if they had originally decreased those priorities).
The following environment variables affect the execution of renice: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization variables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES.
To change the priority of process IDs 987 and 32, and all processes owned by the daemon and root users, enter: renice +1 987 -u daemon root -p 32
Specifies the command path
The following exit values are returned:
Successful completion An error occurred