This will checkout a Drupal contrib module.
-d module_name is the name of the folder that it will be added to (put in path if necessary)
DRUPAL-5--X-X - This should be the version of the module. For example, if the latest stable version is 5.x-1.4, then change this to DRUPAL-5--1-4
contributions/modules/module_name - change module_name to the module name
See Check out Drupal Contributed Module from CVS Snippet