This article describes how to install Drush manually. Although shared and reseller hosting accounts include Drush by default, it is an older version that may not work with the most recent Drupal versions. For example, Drupal 8 requires Drush 8.
The Drush installation process uses composer, a PHP dependency manager. Therefore, if you have not already installed composer on your account, you must do so before installing Drush.
To install Drush on an account that has CageFS enabled, follow these steps:
composer global require drush/drush:8.x
To install Drush 7, type the following command:
composer global require drush/drush:7.x
Determine the CentOS version on your server. To do this, type the following command:
To add Drush to your path, type one of the following commands based on the CentOS version you obtained in step 3:
echo 'export PATH="$HOME/.config/composer/vendor/bin:$PATH"' >> ~/.bashrc
If your server is running CentOS 6, type the following command:
echo 'export PATH="$HOME/.composer/vendor/bin:$PATH"' >> ~/.bashrc
To make the new path take effect immediately, type the following command:
Drush is now installed and ready to use on your account.
Drush should display the most recent version number (at the time this article is written, version 8.1-dev is the latest version).
To update Drush to the newest version, type the following command:
composer global update
For more information about Drush, please visit http://drush.org.