Operating Systems Puzzle

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Across
  1. 3. An open source operating system on Linux.
  2. 6. A secret code or word used to access a place or thing
  3. 7. Computers that are linked together to share resources
Down
  1. 1. Family of open-source Unix-like operating systems.
  2. 2. The most popular OS to date
  3. 4. The most handsome lecturer in TUD.
  4. 5. Short for concatenate, also a cute animal.