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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 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.
            •   It  supports  multiuser  and  multitasking.  Several  users  can  run  multiple  programs  or  processes   Unix
              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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