At some point you are going to want to know some information about the RAM on your Raspberry Pi — how much you have, how much is used, how much is free, etc. Thankfully, there is a simple terminal command to give you this information.

Open a terminal window and enter this command:

free -h

This will give you a quick glance at the RAM usage. The -h flag will display the information in a more human readable format.

If you want to know how hot your Raspberry Pi is running, it’s very easy to get the CPU temperature. Open a terminal window and enter the following command:

vcgencmd measure_temp

This will then display the temperature of your CPU in Celsius.