Lecture 2 os objectives and functions

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Pradeep Kumar TS

Technology

–OS Provides Services for
• Program Development
• Program Execution
• Access to IO Device
• Controlled access to files
• System Access
• Error Detection and response
• Accounting

Hardware Upgrade

Fixes
Evolution of Operating System

An operating system (OS) is a collection of software that manages computer hardware resources and provides common services for computer programs. The operating system is an essential component of the system software in a computer system. Application programs usually require an operating system to function. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware,[1][2] although the application code is usually executed directly by the hardware and will frequently make a system call to an OS function or be interrupted by it. Operating systems can be found on almost any device that contains a computer—from cellular phones and video game consoles to supercomputers and web servers. Examples of popular modern operating systems include Android, BSD, iOS, Linux, OS X, QNX, Microsoft Windows,[3] Windows Phone, and IBM z/OS. All these, except Windows, Windows Phone and z/OS, share roots in UNIX. Presentation Regarding functions of operating systems and their working and other information regarding their uses and types. Useful for Students and other for knowing better about them. Pleases Send Your Valuable Comments regarding it

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