caffeinate(8) on macOS
The text f74a3c133c2a, as OS X 10.9.5, OS X 10.9.4, OS X 10.9.3, OS X 10.9.2, OS X 10.9.1, OS X 10.9 shipped it.
prevent the system from sleeping on behalf of a utility
Flags it lists
-
-d -
-i -
-m -
-s -
-t -
-u