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groff: Invoking groff

 
 2 Invoking 'groff'
 ******************
 
 This section focuses on how to invoke the 'groff' front end.  This front
 end takes care of the details of constructing the pipeline among the
 preprocessors, 'gtroff' and the postprocessor.
 
    It has become a tradition that GNU programs get the prefix 'g' to
 distinguish it from its original counterparts provided by the host (see
 ⇒Environment, for more details).  Thus, for example, 'geqn' is
 GNU 'eqn'.  On operating systems like GNU/Linux or the Hurd, which don't
 contain proprietary versions of 'troff', and on MS-DOS/MS-Windows, where
 'troff' and associated programs are not available at all, this prefix is
 omitted since GNU 'troff' is the only used incarnation of 'troff'.
 Exception: 'groff' is never replaced by 'roff'.
 
    In this document, we consequently say 'gtroff' when talking about the
 GNU 'troff' program.  All other implementations of 'troff' are called
 AT&T 'troff', which is the common origin of all 'troff' derivates (with
 more or less compatible changes).  Similarly, we say 'gpic', 'geqn',
 etc.
 

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Info Catalog groff: Introduction groff: Top groff: Tutorial for Macro Users