《操作系统—精髓与设计原理》一书中myshell编程项目，代码写得很清晰，纠错能力很强大，实现了基本的内部命令：cd、dir、help、echo、environ等，以及实现文件重定向、后台处理等功能。附有实验报告。-" Operating system- the essence and principles of design" , a book myshell programming projects, the code is written very clear, very strong error correction ability to achieve the basic internal commands: cd, dir, help, echo, environ, as well as re-implementation file orientation, background processing and other functions. With a test report.