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On ubuntu, you can do something similar with

    upower -i /org/freedesktop/UPower/devices/battery_BAT1 | grep capacity | awk '{print $2}'
You can see all of your power options with

    upower -e


On Debian:

    bc -l <<< "100 * $(cat /sys/class/power_supply/BAT*/energy_full) / $(cat /sys/class/power_supply/BAT*/energy_full_design)"




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