/sys/class/power_supply
cat: /sys/class/power_supply: Is a directory

/sys/class/power_supply/AC
cat: /sys/class/power_supply/AC: Is a directory

/sys/class/power_supply/AC/uevent
POWER_SUPPLY_NAME=AC
POWER_SUPPLY_ONLINE=1

/sys/class/power_supply/AC/power
cat: /sys/class/power_supply/AC/power: Is a directory

/sys/class/power_supply/AC/online
1

/sys/class/power_supply/AC/device
cat: /sys/class/power_supply/AC/device: Is a directory

/sys/class/power_supply/AC/type
Mains
find: File system loop detected; ‘/sys/class/power_supply/AC/subsystem’ is part of the same file system loop as ‘/sys/class/power_supply’.