What are the recommended ways of defending a remote *nix install from a hamfisted admin?

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http://unix.stackexchange.com – Once in a while (often a long while), I have a difficulty where I execute a command that completely screws up a Linux machine. Most recently, I accidentally mounted-again the root partition (thinking it was the new USB drive I had just formatted), and then proceeded to recursively chown the partition to myself (again, just trying to grant myself user-access to the USB drive). As soon as I realized what I had done (in mid-progress), I aborted it, but the damage was done. Many core programs were no longer root owned, so the machine was essentially in a zombified state. Some user functions (s (HowTos)