procinfo(8) on Linux
The text ce4fc35a64e1, as Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
display system status gathered from /proc
Flags it lists
-
-D -
-F -
-S -
-a -
-b -
-d -
-f -
-h -
-i -
-m -
-n -
-r -
-v