What is an operating system?

What is an operating system? Here are some definitions.

Noun
  1. (software) Software that controls the allocation and usage of hardware resources such as memory, CPU time, disk space, and input and output devices.
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I have one or two criticisms of this operating system, because errors of the kind that I made should be recoverable but are not.
The operating system must be reinstalled, along with all of the necessary support packs and server applications.
Primarily, the software handles operating system reinstalls and hardware configuration on its own.
And it assumes that applications are well-behaved enough to use the protection facilities in the operating system.
But it always lacked focus, initially positioning itself as a intelligent agent software and handheld operating system developer.
In 1991, Torvalds began experimenting with a rudimentary operating system kernel.

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