Raspbian commands
vcgencmd
vcgencmd commands - List available vcgencmd commands. Note there is no tab completion by default, nor a --help or equivalent option.
vcgencmd measure_temp - Returns the temperature as measured by the SoC internal temperature sensor. Output eg. temp=42.2'C
wpa_cli
wpa_cli is a tool to configure and troubleshoot WiFi connectivity on a Raspberry Pi.