Drush is the Drupal Shell, a mighty library of commands that are designed to make your life easier in Drupal. Among the many things you can do with Drush, some of the most exciting (from a designer/site builder’s standpoint) are:
module_name: Download any module
from drupal.org. You can even download a
string of modules by separating the names with spaces.
module_name: Enable any of the
modules that you just downloaded. Like
dl, you can enable a string of modules by
typing a space-separated list.
drush up: This is my single
favorite thing to use Drush for, and the reason that you, dear reader,
MUST LEARN DRUSH. With this simple command, you can update all of your
modules and Drupal core in about five minutes, as opposed to
the—ahem—considerably longer amount of time it
takes to do it manually.
If you’d like to see a demonstration of the merits of using Drush versus installing modules manually, check out the video “More Beer, less effort” from Development Seed: http://developmentseed.org/blog/2009/jun/19/drush-more-beer-less-effort/. Synopsis: installing a site and a pile of modules via Drush versus manually left our hero with an extra hour or more of time on his hands—plenty of time to celebrate with a frosty beverage.