UNIX - An Inroduction
By: Adam Racer
What is an operating system? · Kernel - provides a well-defined interface between programs and the hardware. It is a resource manager where the resources include memory, CPU access, input/output ports, etc. · Shell - interacts with the user, accepting commands and starting user programs. · Utilities - include programs required to make the system useful, such as programs to copy files, or simple text editors. · Windowing system - a collection of programs that implement a graphical user interface. Although the traditional definition of an operating system includes just the kernel, it is now more commonly known as a collection of most or all of these components. How A Kernel Defines the Operating System How a kernel defines the interface between programs and the underlying hardware greatly affects the programs designed for that operating system. Some features that define the kernel are: · Single or Multi-Tasking · A single-tasking......
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