Why, conceptually, there is not inside symfony cmf app console generate bundle. I have tried php app/console generate:bundle, but it doesn't work.
The generate:bundle
bundle command is provided by SensioGeneratorBundle.
composer.json
require:
...
"sensio/generator-bundle": "2.3.*@dev"
Add it to your composer.json , update, register the bundle in app/AppKernel.php
and the command will be available.