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Most succinct way to explain this: look at manual page section 2 -- you have to do everything in here yourself. Forking, sockets, files, redirection, TCP/IP, device drivers, ELF loading, virtual memory, multitasking/scheduling, loadable modules, etc -- you're on your own. ;)


Surprisingly, a lot of things don't require an OS. Lack of networking is the biggest drawback, IMO.

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