说明：  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。本书针对Linux系统的最新特性进行了全面更新，不仅涵盖了详尽的动手教程和现实世界中的实用信息，还提供了与所学内容相关的参考信息和背景资料。通过本书的学习，你将轻松写出自己的shell脚本。
(This is a comprehensive tutorial about Linux command line and shell script programming, mainly including four parts: Linux command line, shell script programming foundation, advanced shell script programming, how to create practical shell script. This book for the latest features of the Linux system for a comprehensive update, not only covers the detailed hands-on tutorial and practical information in the real world, but also provides reference information and background information related to the learning content. Through the study of this book, you will easily write your own shell script.)