An old tool used to format [Unix] (and [Tcl]/[Tk]) [man] pages . Alas, it is one of the less well-known formats about despite its widespread use even now. The sister tool [troff] produces rather pretty output, similar in quality to [LaTeX]. [groff] is the most common modern implementation, and can produce fine nroff-level output even to terminals, so long as they are [UNICODE]-enabled and are using a suitable font.

The basic format is documented in CSTR#54, which is downloadable (as [gzip]ped [PostScript]) from http://cm.bell-labs.com/cm/cs/cstr.html

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