I\'m looking for simplest possible way to automatically recompile coffee scripts into JS.
Reading documentation but still having troubles to get exactly what I want.
The short answer to your question is that the coffee utility wasn't designed for this; combining file-watching and concatenation is actually pretty complex. Expect more sophisticated build tools for CoffeeScript in the near future; until then, you might want to do your project's builds by writing a Cakefile or Ruby Watchr script. Then you can also throw in minification, documentation-generation, and whatever else you need for your particular project (not to mention guaranteeing a particular concatenation order).