VirtualBox VBoxManage | Command Catalogue
If using Windows make sure you’ve put VBoxManage on the path environment variable. Here is how.
VBoxManage Commands
VBoxManage list vms
VBoxManage list runningvms
VBoxManage startvm machine-name
VBoxManage startvm machine-name --type=headless
VBoxManage controlvm machine-name savestate
VBoxManage controlvm machine-name poweroff