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The System Integrity Protection (vulgo “rootless”) feature of OS X El Capitan protects critical filesystem areas from root user modification attempts.

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What is the "rootless" feature in El Capitan, really?

I have just learned about the "Rootless" feature in El Capitan, and I am hearing things like "There is no root user", "Nothing can modify /System" and "The world will end because we can't get root". …
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