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17.7. ionice - get/set program io scheduling class and priority

EXAMPLES
       # ionice -c3 -p89

       Sets process with PID 89 as an idle io process.

       # ionice -c2 -n0 bash

       Runs ’bash’ as a best-effort program with highest priority.

       # ionice -p89

       Returns the class and priority of the process with PID 89.