I use a power bank in my raspberrpi pi, and I want to create script for turn off the Raspberry pi when the level battery is low, but i cannot find any command for visualize the battery level.

I dont know if is possible. Exists any command for visualize the battery level?

Thanks in advance

PD/ Sorry for my english

I use a power bank to power my Raspberry Pi, and I want to create script to turn off the Raspberry Pi when the battery level is low, but I cannot find any command to visualize the battery level.

I don't know if is possible. Does such a command exist?