这是一本关于 Linux 命令行与 shell 脚本编程的全方位教程，主要包括四大部分 :Linux 命令行，shell 脚本编程基础，高级 shell 脚本编程，如何创建实用的 shell 脚本(This is a Linux on the command line and the full range of shell scr ipt programming tutorial, mainly includes four parts: Linux command line based shell scr ipting, advanced Shell scr ipting, how to create a practical shell scr ipt)