troff

troff [-abcivzCERU] [-d cs] [-f fam] [-F dir] [-m name] [-n num] [-o list] [-r cn] [-T name] [-w name] [file ...]

troff is the typesetting processor of the groff (GNU roff) text formatting system. It reads text files containing formatting commands and produces formatted output for various devices including PostScript, PDF, and terminals.troff is usually invoked through groff, which handles preprocessors (tbl, eqn, pic) and postprocessors automatically. Macro packages provide high-level formatting: man for manual pages, ms for general documents, mom for complex documents.The groff implementation extends traditional Unix troff with color support, additional escape sequences, and improved compatibility features while maintaining backward compatibility.

-a

Generate ASCII approximation of typeset output.

Print backtrace with each warning or error message.

Disable color output.

Enable compatibility mode with traditional troff.

Define string c as s.

Set default font family.

Search directory for font files.

Read standard input after processing files.

Include macro package (e.g., man, ms, me, mom).

Number first page as num.

Output only pages in list.

Set register c to value n.

Prepare output for device name (default: ps).

Enable unsafe mode (allows dangerous requests).

Print version number.

Enable warning name. Use -w all for most warnings.

Disable warning name.

Direct use of troff is uncommon; groff is the preferred wrapper that handles the complete processing pipeline. The -U unsafe mode should be avoided unless necessary as it enables potentially dangerous file operations. Compatibility mode (-C) may be needed for older documents.

The original troff was written by Joe Ossanna at Bell Labs in 1973 as part of Unix, evolving from the earlier runoff formatter. After Ossanna's death in 1977, Brian Kernighan rewrote and maintained troff. GNU troff (groff) was developed by James Clark starting in 1989 as a free software replacement, and is now maintained by the groff project as part of the GNU system.

groff(1), nroff(1), man(1), tbl(1), eqn(1)