UNIX VS LINUX

UNIX

·        Founded by Ken Thompson (UTF-8) and Dennis Ritchie (C programming language)

·        Plan- to run one program at a time from the team plan of multiple programs at a time.

·        Rewrote the OS in C.

·        AT&T licensed the source code for the OS.

·        Started selling a version of UNIX (SYSTEM 5).

·        Berkeley (a college) had its own flavour- BSD – Berkeley software distribution.

·        Lawsuit in 1990’s – University of California (BSD 4.4 lite had no source code from AT&T) vs AT&T (SYSTEM 5).

·        Portable Operating System Interface (POSIX) is a standard for compatibility.

·        Most popular version now(MAC OS)

GNU started by RICHARD STALLMAN (brought the idea of free software)

MINIX by Andrew Tannenbaum(used for teaching in college- the fundamentals of OS design)

Linus Torvalds- University of Helsinki (Finland) – wanted to overcome the deficiencies in MINIX.

·        Published on internet

·        Ran on 386 AT which was a cheap pc. And free of MINIX code.

·        Started using GPL- gnu public license.

·        IT is a clone of Unix.

UNIX AND LINUX ARE HIGHLY COMPATIBLE.