The Unix operating system is considered one of the most important in the history of computer OS development. The ideas embedded in this system during its development remain relevant and are regularly used today.
For example:
- the principles of how the file system works;
- the file hierarchy;
- the “Everything is a file” concept;
- multitasking;
- multi-user sessions;
- the broad functionality of the command shell;
- and much more.
Historical hierarchy of Unix OS and Unix-like systems:

Source: Wikipedia
A few links to read from Wikipedia:
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