GNU troff Reference (The GNU Troff Manual)

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## 5 GNU `troff` Reference

This chapter covers all of the facilities of the GNU `troff` formatting engine. Users of macro packages may skip it if not interested in details.

- Text
- Page Geometry
- Measurements
- Numeric Expressions
- Identifiers
- Formatter Instructions
- Comments
- Registers
- Manipulating Filling and Adjustment
- Manipulating Hyphenation
- Manipulating Spacing
- Tabs and Fields
- Character Translations
- `troff` and `nroff` Modes
- Line Layout
- Line Continuation
- Page Layout
- Page Control
- Using Fonts
- Manipulating Type Size and Vertical Spacing
- Colors
- Strings
- Conditionals and Loops
- Writing Macros
- Page Motions
- Drawing Geometric Objects
- Deferring Output
- Traps
- Diversions
- Punning Names
- Environments
- Suppressing Output
- I/O
- Postprocessor Access
- Miscellaneous
- `gtroff` Internals
- Debugging
- Implementation Differences