Adding to Open Directory Group via Command Line

Greetings! This may be a silly question. Our school has traditionally just used OpenDirectory for authentication and contacts and we've never actually needed to bind our clients. I would like to automate more management tasks and I have been able to successfully bind my clients through directory utility. I am wondering if I can take this two steps farther: How do I bind via command line? ( I think I know the answer to this one) How do I add a computer to a specific computer list or computer group on the OpenDirectory server? Thanks for any input!! Steve PS - Sorry if this has been covered. I've been googling, but may be using bad terminology. Also feel free to point me to a reference if I've missed something.