Call a GRUNT task from the command line.

cd whatever
npm install
grunt foo

 
 

...run from the command line (at a Windows command prompt) would fire off the foo task in this Gruntfile.js file which would in turn fire off the bar, baz, and qux tasks:

module.exports = function(grunt) {
   grunt.initConfig({
      pkg: '<json:package.json>',
      sweet: {
         //whatever
      },
      sour: {
         //whatever
      },
      salty: {
         //whatever
      },
      clean: ["Release"]
   });
   grunt.registerTask('bar', 'sweet');
   grunt.registerTask('baz', 'sour');
   grunt.registerTask('qux', 'salty');
   grunt.registerTask('foo', ['bar', 'baz', 'qux']);
};