groff(1) on Linux
The text f7aa60b0bae6, as Debian 3.0 (Woody) shipped it.
front end for the groff document formatting system
Flags it lists
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-U -
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-X -
-Z -
-a -
-b -
-d -
-e -
-f -
-g -
-h -
-i -
-l -
-m -
-n -
-o -
-p -
-r -
-s -
-t -
-v -
-w -
-z