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Supposing this is how my Oracle VirtualBox machines are being started:
VBoxManage startvm "vmname" --type headless
VBoxManage controlvm "vmname" addencpassword "vmname" "/home/user/vm-name-password"
How do I make the command read the password from standard input on terminal?
Rationale: For security reasons I don't want those passwords stored on the server.
After running:
VBoxManage startvm "vmname" --type headless
The following command should ask for the password:
VBoxManage controlvm "vmname" addencpassword "identifier" -
The command uses the identifier visible to the left of the password entry textbox when you start the guest normally with a window. The hyphen at the end causes the request for the password in the command window.
