List all databases from command line

We use a simple batch file for backups that does a mysqldump on each database on our MySQL 5.0 server. When we create a new database on the server, though, we need to modify the batch file, which is easy to forget.

Is there a way, using a command-line program, that I can get a list of all databases on the server so that I can loop over the list and backup each one?

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