Command-line interface to VirtualBox. Includes all the functionality of the GUI and more. More information: https://www.virtualbox.org/manual/ch08.html#vboxmanage-intro.
VBoxManage list vms
VBoxManage showvminfo {{name|uuid}}
VBoxManage startvm {{name|uuid}}
VBoxManage startvm {{name|uuid}} -type headless
VBoxManage controlvm {{name|uuid}} savestate
VBoxManage controlvm {{name|uuid}} poweroff