Everyone who is anyone in tech is familiar with UNIX, the Bell Labs operating system that revolutionized computing systems by becoming the dominant OS on mainframes, workstations and web servers, and, as the progenitor of Linux, formed the foundation for the internet and cloud infrastructure we know today.  But what many don’t know is the team that created UNIX also developed another operating system in the 1980s. This OS may not be as famous as UNIX, but it has been highly influential in its own ways, spearheading several concepts that are cornerstones of distributed computing systems today. The system in question is the Plan 9 OS from Bell Labs, which, starting this week, will have a new home. More on that later, but first a bit more on the history and defining principles of Plan 9.