I just learned about this. Handy little tool!
man is great for learning the nitty gritty about commands, but it doesn't quickly answer how to do common tasks. cheat does.
It's a two-step process to install cheat if you don't already have pip, so here's the commands to run:
sudo apt install pip
then
pip install cheat
Now you should have /usr/local/bin/cheat and you can run it with a command, sort of like man, except it'll print out whatever it has and exit, e.g.:
Pretty handy. 