operating system is? hardware or software, give the example for operating system, one main task of operating system, name tow types of user interface, what is graphical user interface, why is an operating system important, what is command line interface, icons use in ................. interface, comands use in.............. interface, windows use in .................... interface, ........................... user interface easy to use, ...........................user interface  difficult to use, redhat software is................, linux is, ..................... apple company operating system.

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