说明： 这是一个操作系统（计算机系课程）的课程设计。它的功能是模拟文件管理,包括建立用户,建立文件并对文件设置属性.还包括对文件的添加,修改,删除等操作 (This is an operating system (computer science courses) are designed. Its function is simulated document management, including the establishment of users, document also set up document attributes. The document also includes the addition, modification, deletion, etc )
