4.1. History of Linux (Part One)

• Unix is a Third System

• Unix started as "pet" project by Ken Thompson at Bell Labs
   
  
• First OS in a high level language C (invented by Dennis Ritchie), which evolved together with Unix
   
  
• Used at university OS classes
   
  
• When it was successful, AT&T wanted to "make money" with it.
  As AT&T wasn't allowed to sell it, so they licences the code
   
  
• As source was available, Unix evolved fast and diversified.
  -> AT&T Unix, BSD (Berkeley Unix), Ultrix (DEC), AIX (IBM), Solaris (Sun), HP-UX (HP), Xenix (Microsoft), etc.