A sample grunt file.

grunt.js

module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({
    pkg: '<json:package.json>',
    meta: {
      banner: '/* \n' +
          ' * \tAuthor:\t\t<%= pkg.name %>\n' +
          ' * \tWebsite:\t<%= pkg.website %>\n' +
          ' * \tTwitter:\thttp://twitter.com/<%= pkg.twitter %>\n' +
          ' * \n' +
          ' * \tTitle:\t\t<%= pkg.title %>\n' +
          ' * \tBuild:\t\t<%= grunt.template.today("yyyymmddhhmmss") %>\n' +
          ' * \n' +
          ' */'
    },
    coffee: {
      app: {
        src: ['coffee/*.coffee'],
        dest: 'js/source/'
      }
    },
    concat: {
      'js/app.js': [
        'js/lib/jquery.min.js',
        'js/lib/underscore.min.js',
        'js/lib/backbone.min.js',
        'js/lib/mustache.js',
        'js/source/*.js'
      ],
    },
    min: {
      'js/app.min.js': ['<banner:meta.banner>', 'js/app.js']
    },
    compass: {
      dev: {
        src: 'sass/',
        dest: 'css',
        linecomments: false,
        forcecompile: true,
        debugsass: false,
        images: 'images',
        relativeassets: true
      }
    },
    watch: {
      files: ['coffee/*.coffee', 'sass/*.sass'],
      tasks: 'default'
    }
  });

  grunt.loadNpmTasks('grunt-coffee');
  grunt.loadNpmTasks('grunt-compass');

  grunt.registerTask('default', 'compass:dev coffee concat min watch');
};

package.json

{
  "title": "Project name",
  "name": "Your name",
  "website": "http://foobarbaz.com",
  "twitter": "gruber"
}