Linux Is Not Unix

Intro Of Linux :- 

Linux is a Unix-like computer operating system assembled below the model of free and open source s/w development and distribution. The defining part of Linux is the Linux kernel, an operating system kernel 1st released 5 Oct 1991 by Linus Torvalds.

The development of Linux is one of the most prominent examples of free and open source software collaboration: the underlying source code is also used, modified, and distributed—commercially or non-commercially—by anyone under licenses such as the GNU General Public License. Typically Linux is packaged in a format known as a Linux distribution for desktop and server use. Some popular mainstream Linux distributions include Debian(and its derivatives such as Ubuntu and Linux Mint), Red Hat Enterprise Linux (and its derivatives such as Fedora and CentOS), Mandriva/Mageia,openSUSE (and its commercial 'business' derivative SUSE Linux Enterprise Server), and Arch Linux. Linux distributions include the Linux kernel, supporting utilities and libraries and frequently a large quantity of application software to satisfy the distribution's intended use

Unix :-

The Unix operating system was planned and enforced in 1969 at AT&T's Bell Laboratories Within the U.S. by Ken Thompson,Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. It was first released in 1971 and was initially entirely written in assembly language (Programming Language), a common practice at the time. Later, in a key pioneering approach in 1973, Unix was re-written in the programming language C by Dennis Ritchie (with exceptions to the kernel and I/O). The availability of an operating system written in a high-level language. With a legal glitch forcing AT&T to license the operating system's source code to anyone who asked, Unix quickly grew and became widely adopted by educational establishment and businesses. In 1984, AT&T divested itself of Bell Labs. Free of the legal glitch requiring free licensing, Bell Labs began commercialism Unix Operating System as a proprietary product.

GNU :-

The GNU Project, started in 1983 by Richard Stallman, had the goal of making a "complete Unix-compatible software system" composed entirely of free software package. Work began in 1984. Later, in 1985, Stallman started the Free Software Foundation and wrote the GNU General Public License (GNU GPL) in 1989. By the early 1990s, several of the programs required in an operating system (such as libraries, compilers,text editors, a Unix shell, and a windowing system) were completed, although low-level elements such as device drivers, daemons, and the kernel were stalled and incomplete. Linus Torvalds has said that if the GNU kernel had been available at the time (1991), he wouldn't have decided to write his own. 

Linux Isn't Unix Operating System :-

GNU Isn't Unix and Linux is not Unix. We would moreover get that straight from the beginning. Unix and Linux share architecture to a point, but they are totally different creatures, fundamentally different in their design and development. Unix was a serious effort, the outgrowth from only a few prior prototypes, intended from the start to be a commercial grade operating system; Linux began as a toy of interest to only a handful of friends and has grown to the present 1.6 million lines of code entirely incrementally, and almost exclusively in the maintenance phase of its development. Unix was largely carved in stone before anyone had the chance to deploy it in the real world, whereas Linux is the sum of unnumbered solutions and revisions, each done in direct response to practical, real-world issues.