radlist(1) on Linux
The text 913f5c43f1ec, as Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
lists current on-line users and per user stats
Flags it lists
-
-D -
-F -
-Hformat_string -
-M -
-Y -
-b -
-h -
-m -
-n -
-t -
-x -
-y