Me, I'd never heard of catdoc. Googling the term found several packages going by that name, but I presume this is the one being asked about. The page linked says (towards the bottom)
Documentation
Catdoc is documented in traditional Unix man pages. For MS-DOS users plain-text and postscript versions of man pages are included in the distrbution.
Html formatted versions of man pages are available here: catdoc(1) catppt(1) xls2csv(1).
Well, that's two minutes of my life I won't get back.
