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This article from Harvard's CS 61 course covers Unix concepts of pipes, forks, and zombies, explaining how pipes automatically kill programs on closure and how to use pipes to implement blocking waits on child processes.
kamid is a free, portable 9p file server daemon for UNIX-like systems, emphasizing security and correctness. The text announces version 0.2 with installation guides and source code repositories.
A new open-source WebAssembly-based emulator for the 1980s Plexus P/20 Unix server, letting users run SystemV Unix in the browser.