iopending(1m) on macOS
The text d2cd1e267d01, as Mac OS X 10.5.8, Mac OS X 10.5.7, Mac OS X 10.5.6, Mac OS X 10.5.5, Mac OS X 10.5.4, Mac OS X 10.5.3, Mac OS X 10.5.2, Mac OS X 10.5.1, Mac OS X 10.5 shipped it.
plot number of pending disk events. Uses DTrace.
Flags it lists
-
-c -
-d -
-f -
-m