C++实现Fat存储结构，并支持Shell命令，ls列表文件，以其其他命令，包括添加删除目录以及文件，创建软链接，硬连接，批量删除，读写文件，将真实文件写入虚拟FAT文件中-C++ implementation Fat storage structure, and to support the Shell command, ls list of files, with its other order, including add and delete the directory files, create a soft link and hard link to bulk delete, read and write documents, files will be written into the virtual real FAT file