介绍了unix系统的特点、安装及使用，讲解了vi的使用及shell编程，UNIX下的C语言开发环境，文件与目录、进程控制，进程通信，套接字编程等内容。-Introduced the characteristics of unix systems, installation and use, explained the use of vi and shell programming, UNIX under C language development environment, file and directory, process control, process communications, such as socket programming.