The Heirloom Documentation Tools package provides troff, nroff, and related utilities to format manual pages and other documents for output on terminals and printers. Heirloom Documentation Tools are portable and enhanced versions of the utilities released by Sun as part of OpenSolaris, which are a variant of ditroff, which, in turn, descends to the historical Unix troff that generated output for the C/A/T phototypeset
nroff is most prominently used to format Unix manual pages for viewing them on a terminal. This implementation consumes relatively few system resources and is thus suitable for small system distributions. It has been enhanced to generate UTF-8 output.
troff generates PostScript output from the same document source code as nroff. Thus a special use of it is to prepare manual pages for printing. troff is a general-purpose typesetting processor, though. Significant features that have been added in this implementation are:
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