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    Oh, and you can put all these on a separate disk or partition if you like, for security or whatever. The idea is that you can umount /usr and the system will have all it needs for basic functioning, but it can't run any non-system applications. Commented Jan 19, 2011 at 19:16
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    I wish I would've known this years ago. Best explanation I have seen so far. I can't say I looked very hard, but glad to finally know the answer. Commented Sep 27, 2013 at 7:20
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    this is a great answer. i'd donate you 10 of my own points if i could Commented Oct 24, 2013 at 15:16
  • @ultrasawblade is /usr/bin automatically unmounted when there are no users logged in? For example, when LINUX boots and presents the login authentication, is /usr/bin mounted or no? Commented Jan 13, 2015 at 14:21
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    No, it's mounted at boot and stays mounted unless you unmount it, unless your system is configured unusually. Commented Jan 13, 2015 at 16:12