renice - Alters the priority of a running process
The following syntax format is recommended:
/usr/sbin/renice [-n increment] [-p] [-g | -u] ID...
The following syntax format is obsolescent:
/usr/sbin/renice priority [-p] pid... [-g pgrp...] [-u user...]
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about indus-
try standards and associated tags.
Takes the current priority and adds the increment. A negative value
for increment causes the process to run at a lower numbered, therefore
-g Interprets operands following the option as process group IDs.
-u Interprets operands following the option as user names.
-p Resets renice operand interpretation to be process IDs (the default).
A value interpreted as the actual system scheduling priority, rather
than as an increment to the existing system scheduling priority as
specified in the recommended form of the command. The priority value
may be any integer from -20 to 20, including 0, as explained in the
A user name or user ID. All processes with a set_user_ID equal to the
specified value are affected.
A process group ID. All processes in the process group are affected.
pid A process ID. Only this process is affected.
ID A value interpreted as a user name, user ID, a process group ID, or a
process ID, depending on the option specified. If no options are
specified, the value is interpreted as a process ID.
The renice command alters the scheduling priority of one or more running
processes. The ID operands (in the recommended syntax format) or the
option arguments (in the obsolescent syntax format) are interpreted as pro-
cess IDs, process group IDs, or user names. When you issue the renice com-
mand with the -g option, all processes in the process group have their
scheduling priority altered. When you run the renice command with the -u
option, all processes owned by the user have their scheduling priority
altered. By default, the processes affected are specified by their process
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:
20 Runs affected processes when no other processes are running on the sys-
0 Runs at the base scheduling priority.
Runs affected processes very quickly.
[Tru64 UNIX] The preceding values are mapped by the command to those actu-
ally used by the kernel.
[Tru64 UNIX] 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 exit values are returned:
0 Successful completion
>>0 An error occurred
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
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 multi-
byte characters in arguments).
Determines the locale for the format and contents of diagnostic mes-
sages written to standard error.
Determines the location of message catalogues for the processing of
Specifies the command path