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What is an Operating System?An operating system is software, consisting of programs and data, that runs on computers, manages computer hardware resources, and provides common services for execution of various application software.

http://en.wikipedia.org/wiki/Software

http://en.wikipedia.org/wiki/Computer_program

http://en.wikipedia.org/wiki/Data

http://en.wikipedia.org/wiki/Computer

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http://en.wikipedia.org/wiki/Application_software

What is an Operating System?An operating system is the software that manages computer’s hardware and provides a convenient and safe environment for running programs. It acts an interface between programs and hardware resources that these program access ( like memory, hard disk and printer).

Functions of an Operating System

Examples of popular modern

operating systems

Mac OS X Mac OS X Linux Linux

FedoraFedora

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The UNIX Operating SystemUnix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Brian Kernighan, Douglas McIlroy, and Joe Ossanna. The Unix OS Initial release in 1969. The Unix operating system was first developed in assembly language, but by 1973 had been almost entirely recoded in C Unix operating systems are widely used in servers, workstations, and mobile devices

Bell Laboratories at Murray Hill, New Jersey Bell Laboratories at Murray Hill, New Jersey Thompson (left) with Dennis RitchieThompson (left) with Dennis Ritchie

http://en.wikipedia.org/wiki/Computer_multitasking

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Technology

operating systemfunctions

computers hardware

c unix

computer hardware resources

dennis ritchie

unix os initial release

bell labs

ken thompson