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Understanding Operating System

            An Operating System is a system software which acts as an interface between the user and the computer. It is an
            important component of a computer system which controls all other components of the computer system. It helps us
            to communicate with the computer without knowing its language. Without an Operating System the computer is of
            no use. Some of the commonly used Operating Systems are Windows, DOS, UNIX, etc. Let us learn more about these
            operating systems.




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                                                           Operating
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                                                         Operating System

            UNIX
            Unix is one of the oldest, reliable and powerful Operating Systems developed at AT&T’s Bell
            Laboratories in the early 1970’s. It has a simple user interface called Shell which interacts with
            the kernel to get the work done. Some of its important features are:
               • It has a character user interface.                                                        Unix
               • It supports multiuser and multitasking. Several users can run multiple programs or processes
              simultaneously on one system.
               • It has machine independent architecture written in high level language.
               • It has a hierarchical file system to represent information.


            Disk Operating System (DOS)
            After UNIX, DOS is one of the most commonly used Operating Systems. It was written originally by Tim Patterson—
            Father of DOS and owned by Seattle Computer Products. Microsoft released it with an IBM PC as MS-DOS 1.0 in
            1982. It has the following important features:






















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