操作系统文件管理功能的实现 ①可以实现下列命令：

login 用户登录

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

②列目录时要列出文件名、物理地址、保护码和文件长度.

③源文件可以进行读写保护.

-The operating system file management functions to achieve ① can achieve the following command:

login user login

dir column file directory

create create a file

delete delete files

Open to open the file

close Close the file

read read a file

write write file

② directory column lists the file name, physical address, the protection code, and file length.

The ③ source files can be read and write protection.