Unix is a computer operating system created by researchers at AT&T’s Bell Laboratories (Bell Labs) in the 1970’s.Its revolutionary design ushered in a new era of computing by enabling software programs to be written once and then run on computers manufactured by different hardware vendors.

In addition to its immense popularity, Unix inadvertently set the stage for the open source software movement that we know today by freely distributing its source code to research institutions. This source code distribution set in motion a series of events that led to the development of dozens of other “Unix-like” operating systems (including BSD, GNU, and Linux) which, still to this day, rely on core tools and concepts first introduced by Unix decades ago.