Drush, which stands for the “DRUpal SHell”, is a command line interface to Drupal that bills itself as a “swiss army knife” for Drupal developers. The rule of thumb is that if there’s a commonly run task that involves many clicks on a Drupal site, there’s probably a Drush command for it. Drush is also one of the best kept secrets in the Drupal community. Due to its nature it won’t end up in any Drupal.org usage lists, but there is no denying the improvement in workflow that people experience when starting to use it.

Building Drupal Faster with Drush 2.0