Watch for changes on coffeescript files in the current directory and use GruntJS to compile to JS.

coffee.sh

#!/bin/bash

# Watch for changes on coffeescript files in the current directory and use GruntJS to compile to JS.
# See http://gruntjs.com

# Require inotify-tools
# Ubuntu : apt-get install inotify-tools

while true ; do \
  inotifywait -q *.coffee \
  && ( grunt coffee > /dev/null ) \
done

grunt.js

module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({
    coffee: {
      app: {
        src: ['./*.coffee'],
        dest: './'
      }
    }
  });

  // Load tasks from "grunt-sample" grunt plugin installed via Npm.
  grunt.loadNpmTasks('grunt-coffee');
};