vboxmanage-registervm
Register a virtual machine (VM).
TLDR
Register an existing VM
$ VBoxManage registervm [path/to/filename.vbox]
Supply the encryption password file of the VM
$ VBoxManage registervm [path/to/filename.vbox] --password [path/to/password_file]
Prompt for the encryption password on the command-line
$ VBoxManage registervm [path/to/filename.vbox] --password -
