The History and Relationship of UNIX, Linux, and GNU

UNIX originated in the late 1960s at Bell Labs, inspired by the Multics project, and was initially written in assembly before being rewritten in C, establishing a portable operating system.

After Bell Labs released Unix, the University of California, Berkeley created BSD, leading to legal disputes with AT&T over licensing, which eventually spurred the development of free Unix‑like systems.

Richard Stallman launched the GNU project in 1983 to create a completely free Unix‑compatible system, later forming the Free Software Foundation and producing tools such as GCC, Emacs, and the GPL license.

In 1991 Linus Torvalds released the Linux kernel under the GPL, initially as a Minix‑inspired prototype, and combined with GNU tools to form the widely used GNU/Linux operating system.

The article also compares UNIX and Linux, noting that Linux is an open‑source descendant of Unix, while traditional Unix systems remain commercial; it outlines the three‑layer architecture (kernel, shell, applications) and mentions common desktop environments (GNOME, KDE) and major distributions (Ubuntu, Red Hat, CentOS, etc.).

Example of checking kernel and distribution version on a Linux system:

root@AI-Machine:~# uname -a
Linux AI-Machine 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:26:51 UTC 2018 i686 i686 i686 GNU/Linux
root@AI-Machine:~#