I have node and npm on my Centos 7 instance. I did a
sudo npm -g install coffee
%: type -a coffee
coffee not found
%: type -a Coffee
Coffee not found
%: npm bin
%: ls -la ~/node_modules
drwxr-xr-x 3 jonea compgen 4096 Jun 6 10:34 .
drwxr-xr-x 33 jonea compgen 4096 Jun 7 09:33 ..
drwxr-xr-x 4 jonea compgen 4096 Jun 6 10:34 coffee
The package you installed has nothing to do with CoffeeScript check this npm coffee
You need different package
npm install -g coffee-script