What is Drush?

It’s a command line shell and scripting interface for Drupal. The Drush Package Manager allows you to download, enable, disable, uninstall, update modules/themes/profiles/translations from the command line in a very simple way (apt-get style) – just type,

and

in a Drupal directory to install the Views project! Additionally, the Drush Package Manager also allows you to update all your modules and even Drupal core with just one command,