vcgencmd

# print help
vcgencmd --help

# print out all the commands
vcgencmd commands

# CPU temp
vcgencmd measure_temp

# current volts
vcgencmd measure_volts

# throttled state of the system
vcgencmd get_throttled

# print bootloader config
vcgencmd bootloader_config

# print bootlaoder version
vcgencmd bootloader_version