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OPERATING SYSTEM: -
          An Operating System is the Software that manages the computer’s hardware and provides a convenient
          and safe environment for running programs and hardware resources that these programs like Memory,
          hardware and printer.

          Function of O.S: -
               Process Management
               Memory Management
               Data Management
               I/O Management

          LINUX ARCHITECTURE: -

                                       USER
                               OTHER PROGRAM
                                      SHELL

                                      KERNEL
                                   HARDWARE






          KERNEL: -
               It is the interface between H/W devices and Shell.
               It is a Set of Function that makes up the heart of an O.S.
               It controls the execution process, scheduling process fairly for execution on the CPU.
               Allocating memory for an execution processes.

          SHELL: -
               Shell is the Interface between the user and the Kernel.
               It is the command Interpreter to kernel
               The kernel after processing the commands gives back to the Shell.

          History of Unix

             MULTICS          Started in 1995 by AT & T, GE and MIT


              UNICS           Created by Ken Thompson in 1969

               UNIX           Written in 100% c Language and released in 1973



                                                       S. Pradhan
                             (MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
                                             Email Id:-spradhan.iiht@gmail.com
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