GROFF_DIFF(7) - Linux manual page online | Overview, conventions, and miscellany

Differences between GNU troff and classical troff.

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This manual	Reference	Other manuals
groff_diff(7)	referred by	groff(1) \| groff(7) \| groff_filenames(7) \| groff_out(5) \| troff(1)
groff_diff(7)	refer to	getenv(3) \| groff(1) \| groff(7) \| groff_char(7) \| info(1) \| roff(7) \| troff(1)