How to install Ckeditor in Drupal 7 using Drush?
Navigate to your Drupal directory using the following command replacing /path/to/your/drupal/site with the actual path for your drupal directory
cd /path/to/your/drupal/site
Execute the following command to download the ckeditor module from drupal.org
drush dl ckeditor
Execute the following command to enable the ckeditor module
drush en -y ckeditor
Execute the following command to download ckeditor folder in the libraries and configure it
drush ckeditor-download
Execute the following command to clear all caches so the ckeditor is ready to be used
drush cc all