Skilldepository

Simply fire up your terminal and run

caffeinate -dimus

As macOS manual explains, this tool will prevent the system from sleeping on behalf of a utility. I’ve used -dimus parameters, here’s their meaning:

     -d      Create an assertion to prevent the display from sleeping.
     -i      Create an assertion to prevent the system from idle sleeping.
     -m      Create an assertion to prevent the disk from idle sleeping.
     -u      Create an assertion to declare that user is active.
             If the display is off, this option turns the display on
             and prevents the display from going into idle sleep.
             If a timeout is not specified with '-t' option, then this
             assertion is taken with a default of 5 second timeout.
     -s      Create an assertion to prevent the system from sleeping.
             This assertion is valid only when system is running on AC power.