+//usage:#define ionice_trivial_usage
+//usage: "[-c 1-3] [-n 0-7] [-p PID] [PROG]"
+//usage:#define ionice_full_usage "\n\n"
+//usage: "Change I/O priority and class\n"
+//usage: "\n -c Class. 1:realtime 2:best-effort 3:idle"
+//usage: "\n -n Priority"
+