grav(1) on Linux
The text 1bb0556e8cb6, as Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
draws a simple orbital simulation
Flags it lists
-
-count -
-decay -
-install -
-mono -
-ncolors -
-no-ecay -
-no-trail -
-root -
-trail -
-visual -
-window