http://blogs.arondor.com/Gestion-de-contenus/Symfony2-les-commandes-incontournables
Script when I put in prod environnement
# Clear cache
sudo php app/console cache:clear
# Create symbolics links of bundles when ressources directory exists
sudo php app/console assets:install web –symlink
# Create the new merged css files
sudo php app/console assetic:dump –env=prod
# Clear cache
sudo php app/console cache:clear