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I am studying a course of Operating Systems, and I have just read the textbook saying that

UNIX became the basis for Apple's MacOS X, Linux, VMware, and Google Android.

What? ... It surprised me because this sentence tells me that VMware (a virtualization tool) is based on UNIX (an operating system).

Could someone help me understand how we can say VMware is based on UNIX?

7

VMware's ESXi is apparently based on the linux kernel. There is a lawsuit about this because the linux kernel is under GPL v2.

Here is a comparison between a system using a complete linux kernel and a system with VMware ESXi.

enter image description here (Figure under CC BY-SA 4.0 by Software Freedom Conservancy)

Read the following FAQ for full details: Frequently Asked Questions about Christoph Hellwig's VMware Lawsuit

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