This tutorial provides an introduction to using the Groff (GNU Troff) document-preparation system.
本教程提供了使用 Groff (GNU Troff) 文档准备系统的简介。
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If you wish to print the page, specify the -t option to format the page for printing using the groff or troff program.
如果希望输出页面，那么指定- t o选项来格式化页面，以使用groff或troff程序执行输出。
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The Groff distribution includes the groff front-end tool, the troff back-end typesetting engine, and various adjunct tools, which are used in this tutorial.