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WHAT'S AN OPERATING SYSTEM

To understand the operating system is to understand the workings of the entire computer system, because it is the operating system that manages each and every piece of hardware and software. Let's begin by saying that an operating system is the part of the computing system that manages all the hardware and all the software . To be specific, it controls every file, every device, every section of main memory, and every nanosecond of processing time. Therefore, when the user sends a command, the operating system must make sure that the command is executed or, if it's not executed, must arrange for the user to get a message explaining the error. This does not necessarily mean that the operating system executes the commamd or sends the error message -- but it does contro the parts of the system that that do.

The following are the components that support the User Command Interface and that all operating systems have:

The following are examples of today's operating systems:

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