4.1.1. History of Unix: Unix is born

• (Unix vs. UNIX vs. Linux)

• Unix is a Third System
  • Grandfather CTSS (Compatible Time Sharing System)
  • Father was MULTICS

• When AT&T backed out of the MULTICS consortium in 1969, the former MULTICS developers were left with many good ideas

• they also missed the nice (but expensive!) interactive computing environment but also the community that formed around it

• Ken Thompson had an idea how to build a file system (and he needed a machine for his SPACETRAVEL game, 75$!)

• he found an old PDP-7

• the tools to host the game became the core of the later OS! -> strikingly simialar to todays Unices!

• First OS in a high level language C (1973) (invented by _Dennis Ritchie_), which evolved together with Unix