Grunt pass param to CLI from https://raw.github.com/jzaefferer/grunt/3f1f66eb01988609d697fd81b1202e6bdd80bd75/docs/faq.md

howto.md

How can I pass parameters from the command-line?

Whenever you're using alias tasks, you can't pass a flag to aliased tasks. Here are a few patterns to deal with that.

For a global setting available to all tasks, use options:

grunt.registerTask('upload', 'Upload code to deploy', function(n) {
  var target = grunt.option('target');
  // use target var to do something useful
});
grunt.registerTask('deploy', 'validate upload')

You can then call grunt deploy --target=staging

Options can also be used with just the key, without a value: grunt deploy --staging

In other cases you may want to expose additional configuration or global values. In that case, register a task that sets it's arguments as a global or config value:

grunt.registerTask('set_global', 'Set a global var.', function(name, val) {
  global[name] = val;
});

grunt.registerTask('set_config', 'Set a config property.', function(name, val) {
  grunt.config.set(name, val);
});

Then call those with regular flags, along with whatever task will make use of those values:

grunt set_global:name:peter set_config:target:staging deploy