Centos: Update Drupal via Drush

Updating your drupal instance with Drush is a fast and easy way to get the things done:

1. check if pear is installed

# pear version
PEAR Version: 1.9.4
PHP Version: 5.3.3
Zend Engine Version: 2.3.0

2. add the drush channel

# pear channel-discover pear.drush.org
Adding Channel "pear.drush.org" succeeded
Discovery of channel "pear.drush.org" succeeded


3. change to the folder where your drupal site is installed

example given:

# cd /public_html/site_xy

4. update to the new drupal version (example drupal 7.24)

# drush pm-update projects drupal-7.24


you are done

Further documentation on drush specific installation issues:
https://drupal.org/node/1791676