lexgrog(1) on Linux
The text 8c8bdbabe1c9, as Debian 4.0 (Etch) shipped it.
parse header information in man pages
Flags it lists
-
--cat -
--filters -
--help -
--man -
--version -
--whatis -
-V -
-c -
-f -
-h -
-m -
-w