Linux Shout published a quick tutorial about how to use the command line to create, list, start and stop VirtualBox VMs.
Use command line to create, list, start & stop VirtualBox VMs
How to use command line tool VBoxManage to create VirtualBox virtual manchine and manage the same- list, delete, network, stop, start & more.
Use command line to create, list, start & stop VirtualBox VMs