But my gut feel for this is that Unix is indeed the world's most successful operating system ever. 900 million concurrent users? I don't think even Windows has managed that.

If you're new to the UNIX operating system, especially if you're familiar with Windows, you'll find that the file access control mechanisms might not be exactly what you expect.

On "1-2-3-4-5-6-7-8-9-0 Day," tech lovers all over the world celebrated the moment when the clocks in the popular Unix computer operating system struck that exact stream of numbers. But on Feb. 13 ...

In the early 1980s, the Unix operating system was already in widespread use throughout academia and businesses for both servers and workstations. It was being rapidly developed and deployed. Unix ...