These commands enable you to attach and retrieve string data for a virtual machine or for an Oracle VM VirtualBox configuration, by specifying global instead of a virtual machine name. You must specify a keyword as a text string to associate the data with, which you can later use to retrieve it. For example:

VBoxManage setextradata Fedora5 installdate 2006.01.01
VBoxManage setextradata SUSE10 installdate 2006.02.02

This example would associate the string "2006.01.01" with the keyword installdate for the virtual machine Fedora5, and "2006.02.02" on the machine SUSE10. You could then retrieve the information as follows:

VBoxManage getextradata Fedora5 installdate

This would return the following:

VirtualBox Command Line Management Interface Version version-number
(C) 2005-2018 Oracle Corporation
All rights reserved.

Value: 2006.01.01

You could retrieve the information for all keywords as follows:

VBoxManage getextradata Fedora5 enumerate

To remove a keyword, the setextradata command must be run without specifying data, only the keyword. For example:

VBoxManage setextradata Fedora5 installdate