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