The general name for a family of text formatting programs and mark-up languages, all descended from CTSS's 1964 `RUNOFF` system. Current versions are known as `groff`, `troff`, `nroff`, `ditroff`, etc. and are used at the command line to format manual pages (`man` pages) on Unix-like operating systems.

roff is the general name for a set of text formatting programs, known under names like troff, nroff, ditroff, groff, etc. A roff system consists of an extensible text formatting language and a set of programs for printing and converting to other text formats. Unix-like operating systems distribute a roff system as a core package. The most common roff system today is the free software implementation GNU roff, groff. groff implements the look-and-feel and functional‐ ity of its ancestors, with many extensions. -- From the man roff manual page, copyright Free Software Foundation, Inc. See the man page for a longer history.

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