VBoxManage createvm --name "Debian 9" --register
VBoxManage modifyvm "Debian 9" --memory 1024
VBoxManage startvm "Debian 9"
VBoxManage startvm "Debian 9" --type headless
VBoxManage controlvm "Debian 9" poweroff soft
VBoxManage snapshot "Debian 9" take "Aug 1 - Debian 9"
VBoxManage snapshot "Debian 9" restore ""Aug 1 - Debian 9""
VBoxManage list vms
VBoxManage list runningvm