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Run this command as root to get enough stats. It works on AMD and Intel machines, including desktops. If ran on a laptop it'll give you suggestions on extending your battery life.
You'll need to install PowerTOP if you don't have, via 'apt-get install powertop', etc.
To grep the output use: sudo powertop -d | grep ...
The many command suggestions PowerTOP gives you alone will increase your command-line fu!