In this post I have made points where significant developments have taken place, which led to the development of Unix and Linux operating systems:
1) In 1968, layered multiprogramming system known as MULTICS (Multiplexed Information and Computing Service) was developed by E. W. Dijkstra.
2) Ken Thompson who was one of the Bell Labs researchers, started working on MULTICS in a PDP-7 minicomputer and he developed a new system. Brian Kernighan (another researcher at Bell Labs) called it UNICS (UNiplexed Information and Computing Service) as a pun for “Eunuchs”. Later it was changed to Unix.
3) In 1974, Ken Thompson along with Dennis Ritchie developed Unix in PDP-11 computers with a new language called B which was later developed to C language. This version of Unix was known as version 6.
4) In 1979, first portable version of Unix called version 7 was developed.
5) In 1982, University of California at Berkeley released improved version of Unix called lBSD (First Berkeley Software Distribution). Networking protocols like TCP/IP was used with Unix.
6) In 1987, a Unix like system based on microkernel design known as MINIX was developed.
7) In 1989, 4.3BSD and System V Release 3 were developed for Unix.
8) In 1991, Linus Torvalds developed a new system called as Linux which was similar to MINIX.