Drush basics
Drush is a command-line tool that runs operations on a Drupal site. Because Drupal has a backend administrative area, users with the appropriate permissions can log in and operate a Drupal application. However, there are times when an application is unavailable, such as when it has pending database updates or requires a cache clear. Also, developers want to be able to run commands remotely and in scripts during events such as code deployments, without having to subsequently log in through the web application.
Operations is an overloaded term in technology, but with Drush, operations are focused on actions that run on the Drupal application – things such as logging in as a user, clearing the cache, or updating configuration from code to the application. Drush does not manage code in Drupal.
Like Git, Drush can leverage SSH to manage remotes. This feature is known as site aliases in Drush. Site aliases are helpful for developers who work on multiple Drupal applications...
