In this chapter, we will review two of the most common kinds of extensions that you will encounter while working on a Symfony project:
doctrine:database:create, and so on)
Symfony ships with a powerful console component. Just like many components in Symfony, it can also be used as a standalone component to create command-line programs. In fact, Composer (http://getcomposer.org), the dependency manager that you use every day with Symfony, has its command line-based on the Symfony Console component.
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