Introduction to Drush
Drush, short for Drupal shell, is a command-line shell and scripting interface for Drupal. Using Drush, developers can manage and maintain their Drupal websites from the server command line.
Drush makes website development easier by bypassing all of web services, allowing you to make direct updates to the code and database. It can even directly download and install software and modules for you, so that you don't have to do it yourself.
Drush has developed alongside Drupal, and there are several different available versions of Drush, just as there are versions of Drupal. The most current, stable version is Drush 6, which can be used with any supported version of Drupal.