pngphoon(1) on Linux
The text c6ab2d1f87f4, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
Creates a png file with the current phase of the moon
Flags it lists
-
-b -
-f -
-h -
-s -
-w -
-x -
-y