ETOOBUSY 🚀 minimal blogging for the impatient
caffeinate helps you prevent Mac OS X to go into sleep mode.
Or, in the man page own terms:
Prevent the system from sleeping on behalf of a utility.
After setting up a monitor for my Flaky internet connection, I had an issue in leaving it running while not actively using my computer - after some time, Mac OS X goes in sleep mode and the monitor stops.
This is where I discovered caffeinate, which is designed exactly to prevent this (from the command line).
Useful to remember for the future!