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Tuesday, 1 January 2013

What is an Operating System?

Posted on 03:57 by Unknown


Operating System is :
A program that acts as an intermediary between a user of a computer and the computer hardware.

Operating system goals:

  • Execute user programs and make solving user problems easier.
  • Make the computer system convenient to use.
  • Use the computer hardware in an efficient manner.


Some definition of operating system :

* OS is a resource allocator
    Manages all resources
    Decides between conflicting requests for efficient and fair resource use

* OS is a control program
    Controls execution of programs to prevent errors and improper use of the computer

* No universally accepted definition

* “Everything a vendor ships when you order an operating system”is good approximation
      But varies wildly

* “The one program running at all times on the computer”is the kernel. Everything else is either a system program (ships with the operating system) or an application program
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