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  • Not anything. If a file has an immutable attribute, for example, then even root can't change it (unless he explicitly removes that attribute). Commented Dec 21, 2017 at 15:03
  • @Ruslan yes, but it's too much exceptional case he is new so I explain him as a basic, by default these kind of attributes do not occur. Commented Dec 21, 2017 at 16:10