In this recent post from the Liip blog, they talk about using the console functionality that comes with the Symfony2 framework to run bundles from the command line.

Seems at least some people had the same idea as I had, retrieving data from a feed via HTTP GET. So Symfony2 comes up with a nice little wrapper - the console. Unfortunately the documentation on the website only gives a very brief introduction to it Located in the app directory of your project it is ready to be called as soon your Symfony2 installation is ready to be used. Executing it on the command line without an argument it exposes its help page.

He shows you how to get your bundle exposed to the console and a few steps you'll need to do to make it properly executable. He includes a simple "configure()" method you can use to set up a few other things like bundle name, description and arguments to be passed in.