说明：  功能最强在的编辑器——vi vi是所有UNIX系统都会提供的屏幕编辑器，它提供了一个视窗设备，通过它可以编辑文件。当然，对UNIX系统略有所知的人，或多或少都觉得vi超级难用，但vi是最基本的编辑器，所以希望读者能好好把它学起来，以后在UNIX世界里必将畅行无阻、游刃有余，因为其他几种文本处理器并非UNIX标准配备。说不定别人的Linux机器没安装joe或pico，如果您不会vi，那您可能就没辄了。
(The most powerful editor in- vivi all UNIX systems will provide a screen editor, it provides a window of equipment, which can edit the document. Of course, a slight knowledge of UNIX systems, and more or less difficult to find super-vi, but vi is a basic editor, I hope readers can learn it properly, after the UNIX world will Cheong Hang access, little wonder, since several other UNIX text processor is not standard equipment. Maybe someone else)