Some nice little snippets of command line courtesy of A Slice of Raspberry Pi.

To find out the clock speed of the ARM processor type “vcgencmd measure_clock arm” at the command line prompt and press Enter:

pi@raspberrypi ~ $ vcgencmd measure_clock arm_

This should return a result similar to the following, which in my case shows that the ARM processor is running at 700 MHz (700,000,000 Hz):

frequency(45)=700000000

You can also measure your system’s core frequency by typing “vcgencmd measure_clock core” at the command line prompt and press Enter:

pi@raspberrypi ~ $ vcgencmd measure_clock core_

This should return a result similar to the following, which in my case shows that the system core is running at 250 MHz (250,000,000 Hz):

frequency(1)=250000000

To measure the voltage your system is running at type “vcgencmd measure_volts” at the command line prompt and press Enter:

pi@raspberrypi ~ $ vcgencmd measure_volts_

This should return a result similar to the following, which in my case shows that the system is running at 1.20 volts:

volt=1.20V

Finally you can measure your system’s core temperature by typing “vcgencmd measure_temp” at the command line prompt and press Enter:

pi@raspberrypi ~ $ vcgencmd measure_temp_

This should return a result similar to the following, which in my case shows that the system is running at at temperature of 48.2 deg C:

temp=48.2’C