Operating Systems

What is an operating system?

  • model of the layers of software incorporated in the operating systemThere are more than a few.
  • What others are out there?
  • Evolution of Operating Systems
  • How Operating Systems Work - to quote How Things Work,

    At the simplest level, an operating system does two things:

    1. It manages the hardware and software resources of the computer system. These resources include such things as the processor, memory, disk space, etc.

    2. It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.

schematic of how UNIX works like a bullseye with the Kernel at the center, surrounded by the Shell, which is surrounded by the ApplicationsOperating systems can be either

So, let's look at UNIX

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