Drush for Drupal 7 QuickStart on CentOS Linux
The Linux Tutorial Shows You Step-by-Step How-to Install and Getting-Started with Drush Command Line Interface for Drupal 7 on CentOS 5/6/7 i686/x8664 Linux+GNU Desktop/Server.
Drush is a command line shell and Unix scripting interface for Drupal. If you are unfamiliar with shell scripting, reviewing the documentation for your shell (e.g. man bash) or reading an online tutorial (e.g. search for “bash tutorial”) will help you get the most out of Drush.
Open a Shell session
(Press “Enter” to Execute Commands)
Or Login into the Server Shell.
How-to Install Composer Manager for PHP:Installing Composer for PHP
Installing Drush CLi for Drupal7 on CentOS
composer global require drush/drush:dev-master
Insert Drush into User Path
echo "export PATH=$PATH:$HOME/.composer/vendor/bin" >> $HOME/.bashrc
Testing Drush Installation
Getting Started with Drush 7 CLI Commands:Drush 7 Commands Quick-Start