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Diagram showing the key Unix and Unix-like operating systems.

Unix is a multitasking, multiuser computer operating system that exists in many variants. The original Unix was developed at AT&T's Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.


  • Unix is user-friendly — it's just choosy about who its friends are.
  • Unix was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
    • Doug Gwyn, in Introducing Regular Expressions (2012) by Michael Fitzgerald
  • Linux users think Abraham was ordered to sacrifice Linus as a burnt offering, GNU users think Abraham was ordered to sacrifice Stallman as a burnt offering. Linux users believe in the holy trinity of GNU/Linux/NvidiaBlobs, BSD users believe in the one and only UNIX. Linux users are fine with Tux toys and stickers, BSD users believe in no graven images. Linux users are subdivided into those that argue about interpretations of freedom and whether the establishment is corrupt, BSD users are subdivided according to which BSD is the true descendant of UNIX(pbuh).
  • The Unix room still exists, and it may be the greatest cultural reason for the success of Unix as a technology. More groups could profit from its lesson, but it's really hard to add a Unix-room-like space to an existing organization. You need the culture to encourage people not to hide in their offices, you need a way of using systems that makes a public machine a viable place to work - typically by storing the data somewhere other than the "desktop" - and you need people like Ken and Dennis (and Brian Kernighan and Doug McIlroy and Mike Lesk and Stu Feldman and Greg Chesson and ...) hanging out in the room, but if you can make it work, it's magical. When I first started at the Labs, I spent most of my time in the Unix room. The buzz was palpable; the education unparalleled.
  • UNIX is simple and coherent, but it takes a genius (or at any rate, a programmer) to understand and appreciate its simplicity.
  • I think the Linux phenomenon is quite delightful, because it draws so strongly on the basis that Unix provided. Linux seems to be the among the healthiest of the direct Unix derivatives, though there are also the various BSD systems as well as the more official offerings from the workstation and mainframe manufacturers.
  • Those who don't understand Unix are condemned to reinvent it, poorly.
    • Henry Spencer, in Introducing Regular Expressions (2012) by Michael Fitzgerald
  • Anything new will have to come along with the type of revolution that came along with Unix. Nothing was going to topple IBM until something came along that made them irrelevant. I'm sure they have the mainframe market locked up, but that's just irrelevant. And the same thing with Microsoft: Until something comes along that makes them irrelevant, the entry fee is too difficult and they won't be displaced.
  • Will journalling become prevalent in the Unix world at large? Probably not. After all, it's nonstandard.

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