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.

OS\Debug\dwp.obj
..\.....\fileM.exe
..\.....\fileM.obj
..\.....\fileM.pdb
..\.....\vc60.pdb
..\fileM.cpp
..\fileM.dsp
..\fileM.dsw
..\fileM.ncb
..\fileM.opt
..\fileM.plg
..\Debug
OS

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