README.md - energy - measure energy usage
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       README.md (527B)
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            1 # energy
            2 
            3 `energy` measures the energy consumed while executing a command,
            4 similarly to how `time(1)` measures time usage.
            5 
            6 As per-process energy measurement is not possible, this is done by
            7 querying hardware counters.  Hence the energy usage is the net energy
            8 usage of the entire system, including other processes.  To measure the
            9 net usage of a command, subtract the energy usage of the system at
           10 idle (e.g. by measuring the energy usage of `sleep 1` or similar).
           11 
           12 See the [manual page](man/energy.1) for more documentation.