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Slashdot: Remembering How Plan 9 Evolved at Bell Labs

Remembering How Plan 9 Evolved at Bell Labs
Published on February 26, 2024 at 12:04AM
jd (Slashdot reader #1,658) writes: The Register has been running a series of articles about the evolution of Unix, from humble beginnings to the transition to Plan9. There is a short discussion of why Plan9 and its successors never really took off (despite being vastly superior to microkernels), along with the ongoing development of 9Front. From the article: Plan 9 was in some way a second implementation of the core concepts of Unix and C, but reconsidered for a world of networked graphical workstations. It took many of the trendy ideas of late-1980s computing, both of academic theories and of the computer industry of the time, and it reinterpreted them through the jaded eyes of two great gurus, Kenneth Thompson and Dennis Ritchie (and their students) — arguably, design geniuses who saw their previous good ideas misunderstood and misinterpreted. In Plan 9, networking is front and center. There are good reasons why this wasn't the case with Unix — it was being designed and built at the same time as local area networking was being invented. UNIX Fourth Edition, the first version written in C, was released in 1973 — the same year as the first version of Ethernet. Plan 9 puts networking right into the heart of the design. While Unix was later used as the most common OS for standalone workstations, Plan 9 was designed for clusters of computers, some being graphical desktops and some shared servers... Because everything really is a file, displaying a window on another machine can be as simple as making a directory and populating it with some files. You can start programs on other computers, but display the results on yours — all without any need for X11 or any visible networking at all. This means all the Unixy stuff about telnet and rsh and ssh and X forwarding and so on just goes away. It makes X11 look very overcomplicated, and it makes Wayland look like it was invented by Microsoft.

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