Drush is a command line interface for Drupal. Most of the tasks for building and maintaining a website are repetitive and involve filling in forms on administration pages. The majority of these tasks can be achieved with a single Drush command, drastically shortening the development and maintenance time of a project.
Chapter 1, Installation and Basic Usage, starts with a couple of jaw-dropping examples, followed by an introduction to Drush, and then focuses on installation, usage, and some basic concepts.
Chapter 2, Executing Drush Commands, shows how common site-building and administration tasks in Drupal projects can be performed faster and easier using Drush commands, right after it has been installed. In order to demonstrate this, a sample Drupal project will be installed, configured, extended, monitored, and tested using Drush commands.
Chapter 3, Customizing Drush, dives into advanced topics such as writing and altering commands, executing scripts, working with site aliases and configuration files, and customizing our terminal.
Chapter 4, Extending Drush, expands the Drush toolkit by installing and testing contributed modules which implement new Drush commands.