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What is Linux? - Linux.com
What is Linux? - Red Hat
Linux - Wikipedia
What is Linux? {Understanding Linux Operating System}
What Is Linux and What Does It Do? - Linux Explain
What is Linux? - Opensource.com
What is Linux? Commands Glossary and FAQ - Coursera
What is Linux? Everything You Need to Know - SoftwareLab
Understanding Linux - Red Hat
What Is Linux? - Oracle