Drush allows you to perform all types of Drupal specific tasks easily from the command line without going through the Drupal interface. It is a command line shell and scripting interface for Drupal.
Install Drush On CentOS
Follow the below below steps to install Drush.
First make sure pear is installed on your server by running the below command:
# pear version
If pear is not installed, run the below command to install pear.
# yum install php-pear
Now run the following command to allow pear to recognize drush.
# pear channel-discover pear.drush.org
Then install drush using below command:
# pear install drush/drush
After installing drush execute the below command to make sure Drush is successfully installed.
# drush status
Congratulations! You have successfully installed Drush on CentOS.