Updating modules with Drush and Agaric's wrapper scripts
sudo /srv/scripts/agaric-updatemodule.sh MODULENAME
Drush can update everything at once without listing a module name but I'm not sure my script (attached) will add them to SVN right if it does (if my script even adds it to SVN right). You can and probably should do this on the test site first, note that everything's working (and hit update.php and make sure that doesn't break anything) and then SVN update live to get the changes over there (and hit update.php again on the live instance of the site, too).
Note: this won't work for core modules which have to be updated with core but for all other modules -- or rather, module you should be able to: