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.
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原文出处：Netkiller 系列 手札
本文作者：陈景峯
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