troff(1) on Linux
The text cc238c6f887d, as Debian 3.0 (Woody) shipped it.
format documents
Flags it lists
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-C -
-E -
-F -
-M -
-R -
-T -
-U -
-W -
-a -
-b -
-d -
-f -
-i -
-m -
-n -
-o -
-r -
-v -
-w -
-z