说明：  主要介绍了sh的变量、基本语法、程序设计等。如果掌握了这些内容，在学习其他UNIX下编程语言的时候，相信有一定的好处，我们说了，在大多数的UNIX中都提供Bourn Shell，而且很少有象sh这样强大的脚本编辑语言了，是系统管理员和程序员的一笔财富，并且不需要额外的软件环境，对文件等处理借助unix命令，实现起来比c实现还要简单。
(Mainly introduces the variables, basic grammar sh, program design, etc. If mastered these content, in the study other UNIX programming language, believe that certain benefits, we said, in most of the UNIX in Bourn provide Shells, and there are few such powerful script as sh scripting language, is a systems administrator and the programmer s wealth, and no additional software environment, such as file with Unix commands, realize with up to achieve simple than c. )