I want to create 3 users. First user have only the read only permission, that is this user can read all file but can not write, delete and edit file?
The second user is execute only user can not see any file from machine but he can fire all file command like copy,edit etc.
The last user only concern about terminal window,he login through terminal like Alt+F2 window after that he can't see desktop screen, only terminal window like ms-dos system (No graphical user interface only terminal).