[Linux] To use upower command to check the power remaining

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How to use upower

If we want to check the power remaining on Ubuntu, and we don't want to open the graphical interface to confirm, we can use upower command.

If you want to see the complete information, you can use the following command to search:

upower -i /org/freedesktop/UPower/devices/battery_BAT0

Output:

native-path:          BAT0
  vendor:               SP1
  model:                L17M3PB1
  serial:               1657
  power supply:         yes
  updated:              January 2, 2020 (Thursday) 15:49:51 (32 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               discharging
    warning-level:       none
    energy:              21.56 Wh
    energy-empty:        0 Wh
    energy-full:         35.93 Wh
    energy-full-design:  45 Wh
    energy-rate:         20.75 W
    voltage:             11.008 V
    time to empty:       1.0 hours
    percentage:          61%
    capacity:            77.3111%
    technology:          lithium-polymer
    icon-name:          'battery-full-symbolic'
  History (charge):
    1577951391    61.000  discharging
  History (rate):
    1577951391    20.750  discharging

If we only want to check the remaining battery capacity, we don't actually need to display so much other information.

upower -i $(upower -e | grep BAT) | grep --color=never -E "state|to\ full|to\ empty|percentage"

Output:

state:               discharging
time to empty:       1.0 hours
percentage:          56%

It can be seen that my battery is not charging now, and there is only one hour left from no electricity, and the capacity is about 56%.