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Drush is a command line shell and Unix scripting interface for Drupal. Once Drush is installed you can run the following code to update a single module. Please backup your database first!
drush dl
drush updb
The code above overwrites the files in your module folder with the new ones then performs any updates to the database.
The reason for doing it this way rather than using
drush up
is that you don't update all the modules to their latest version . You may be happy running an old version of a module, their can incompatibility issue between modules or you don't have the time to do a full regression test on the site. The method outlined above is a way that allows you to keep your Drupal site secure.
