:为LINUX 设计一个简单的二级文件系统。要求做到以下几点：

1、可以实现下列几条命令（至少4条）。

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Dir 列文件目录

Create 创建文件

Delete 删除文件

Open 打开文件

Close 关闭文件

Read 读文件

Write 写文件

-: In order to design a simple LINUX file system 2. Request do the following: 1, can be achieved following a few commands (at least 4). Login User Login Create directory Dir column Delete delete the file create a file to open the file Open Close document Close Reading paper Read Write Write document