模拟文件管理。设计并调试一个简单的文件系统，模拟文件操作命令的执行。深入了解主要文件操作命令的执行过程，掌握它们的基本实施方法-Analog document management. Design and debugging a simple file system, file manipulation commands execution simulation. Insight into the execution of the main file manipulation commands, master their basic implementation method