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Shutting down the computer using Terminal ('sudo halt') requires my password.
But while Shutting it down it using GUI, I do not need to enter my password.
So,

  1. Does the GUI store my computer password?
    • If not, then how can it execute a command without administrator privileges?
  2. Or is there any command with which I can turn my computer off using Terminal without entering my password?
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I'm not able to provide a full answer, but here's a hint: PolicyKit –  gertvdijk Jul 22 '13 at 12:21
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