sm(6) on Linux
The text 8a7e1b889ef1, as Debian 10 (Buster) shipped it.
Displays a short text fullscreen
Flags it lists
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-- -
--align -
--background -
--font -
--foreground -
--help -
--invert -
--rotate -
--version -
-V -
-a -
-b -
-f -
-h -
-i -
-n -
-r