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====== Ubuntu - Processes - Change process priority ======

Use **nice** and **renice** commands. -20 highest priority,  19 lowest.

The default value of all the processes is 0.

----

===== Start process at lowest priority =====

<code bash>
nice -n 19 ./process_intensive_task
</code>

----

===== Change priority of running process =====

This will set the priority of process id no 123 to -1.

<code bash>
renice -1 123
</code>

This will set the priority of process id no 2345 to -4, which will in turn increase its priority over others.

<code bash>
renice -4 -p 2345 
</code>


This will set the priority of the process id 3456 to 13, and all the process owned by user "john" to the priority of 15.
<code bash>
renice 13 -p 3456 -u john 15
</code>


This will set all process owned by "john","peter" and also the group "custom" to 14.

<code bash>
renice 14 -u john,peter -g custom 
</code>