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Features of DOS

            It has the following important features:
              It is a Single-user operating system.

               he user interacts with the OS in a text mode environment.
              It does not support a  raphical interface  so the mouse cannot be used as an input device.
               asic file management functions like creating  renaming  copying  moving  deleting  etc.  can be easily
              performed at “ ommand  rompt”.

            Unix

             nix is first among the known operating systems that have been in use in mainframes  minicomputers and
            microcomputers. It has been a more popular operating system in universities  big business houses  etc. and
            is widely used in servers  workstations and mobile devices. It was originally developed in      at       ell
             abs. Initially it was developed in assembly language but by      it was recoded in    which opened further
            scope of development and helped in making it portable.
             nix happens to be the greatest contributor in the OS community as it was the first to be developed before
             indows    OS  or   inux.   he   inux  that  we  see  today  is  the  outcome  of   nix  operating  system.   he   nix
            environment and the client server program model were essential elements in the development of internet.

             nix OS is made of three ma or components: kernel  standard utility program  and system configuration files.

            Solaris
            Solaris is a  nix-based operating system that was originally developed by Sun
            Microsystems and was called as SunOS during     .  t present it is known as
            Oracle Solaris after its  ac uisition by Oracle  in  anuary     .

            Solaris is known for its scalability and for originating many innovative features.
            Solaris supports workstations and servers that are established by Sun Microsystem and other vendors. It
            helps symmetric multiprocessing where two or more identical processors are connected to a shared main
            memory and the single operating system controls all the processors.
            Solaris was historically developed as proprietary software.  hen in  une    5  Sun Microsystems released
            and founded the OpenSolaris as an open source pro ect.  fter the ac uisition in  anuary      by Oracle  it
            decided to discontinue the OpenSolaris distribution and its development model. In  ugust       the new
            version Solaris    was introduced as a closed source proprietary operating system.

            Microsoft Windows
            Microsoft  indows is a widely used graphical user interface operating system for personal
            computers and mobiles that provide a standard appearance on a rectangular screen. It
            was first introduced in    5. In  indows  the user need not remember all the commands
            but needs to recognise the graphical representation for the application on the screen in
            order to use them.  he ease in its use has made  indows a very popular operating system
            among the users.

             indows was developed during    5.  indows as of now is an outcome of many changes in its version over
            the years.  ifferent versions of  indows since its development are:
               indows  .                  indows  .                  Windows 95              Windows 98
              Windows NT                  indows                      indows M                indows


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