Check Mac fan speed for Mojave in Terminal

Problem:

I would like to check the fan speed of my Mac in Mojave without installing any additional programs. I am already comfortable using Terminal. I don't care much about fan or temperature details, I just want to know if the fan is working. How can I check the fan speed?

Solution:

The following steps below can help you check fan speed in Terminal. This is one of several ways to do so.

• open Terminal
• use the following command:

  
            sudo powermetrics -i 200 --samplers smc | grep Fan
          

If all went well then you should see the fan speed printed to the terminal repeatedly:

References:

• Details of the "powermetrics" command: https://www.unix.com/man-page/osx/1/powermetrics/