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What is Linux ?
Linux is a Unix clone written from scratch by Linus Torvalds with assistance from a loosely-knit team of programmers across the Net. It aims towards POSIX compliance. It has all the features you would expect in a modern fully-fledged Unix, including true multitasking, virtual memory, shared libraries, demand loading, shared copy-on-write executables, proper memory management and TCP/IP networking.