Removing a Virtual Machine from VirtualBox

Below are the steps to remove a virtual machine from the command line:

1. Remove the disk from the VM:
   VBoxManage modifyvm xfce-test -hda none
2. Unregister the VM:
   VBoxManage unregistervm xfce-test
3. Unregister the disk (vdi):
   VBoxManage unregisterimage disk /path/to/vdi