ionice(1) on Linux
The text 0a779f55aed7, as Debian 7 (Wheezy) shipped it.
set or get process I/O scheduling class and priority
Flags it lists
-
--class -
--classdata -
--help -
--ignore -
--pid -
--version -
-V -
-c -
-h -
-n -
-p -
-t