Unix history and foundation of Linux (simplified)

1969: a UNIX like OS on PDP 7 was written by Ken Thompson in Bell Labs  
     It was single user, non-multitasking, written in assembler;

1973: C programming language by Dennis Ritchie in Bell Labs;

1975: First widely available version of UNIX (written in C);

Late seventies: two main stream UNIX distributions - System V from Bell Labs
                and Berkeley release.

Eighties: commercial UNIX operating systems: DEC, Sun, IBM, etc.

1985: GNU, the Free Software Foundation, is founded (Richard Stallman)

1991: Starting of the Free Family Berkely like OS, BSD, (NetBSD, FreeBSD, OpenBSD). 

1991: Finnish graduate student Linus Torvalds announces release of Linux 
       based on GNU tools. 

Now days: numerous distributions of Linux; the fastest developing OS; 
          accepted by some commercial UNIX vendors (IBM, Sun, HP, SGI). 





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