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8 VBoxManage reference
• dvdattach inserts a DVD image into the virtual machine or connects it to the
host DVD drive. With this command (as opposed to VBoxManage modifyvm),
the image file does not first have to be registered with VirtualBox.
You can use VBoxManage list hostdvds to display all the drives found on
the host and the names VirtualBox uses to access them.
• floppyattach works in a similar way.
• setvideomodehint requests that the guest system change to a particular video
mode. This requires that the guest additions be installed, and will not work for
all guest systems.
• The setcredentials operation is used for remote logons in Windows guests.
For details, please refer to chapter 9.2, Automated Windows guest logons
(VBoxGINA), page 128.
8.10 VBoxManage discardstate
This command discards the saved state of a virtual machine which is not currently
running, which will cause its operating system to restart next time you start it. This
is the equivalent of pulling out the power cable on a physical machine, and should be
avoided if possible.
8.11 VBoxManage snapshot
This command is used for taking snapshots of a virtual machine and for manipulating
and discarding snapshots.
The take operation takes a snapshot of a virtual machine. You must supply a name
for the snapshot and can optionally supply a description.
The discard operation discards a snapshot specified by name or by identifier
(UUID).
The discardcurrent operation will either revert the current state to the most
recent snapshot (if you specify the --state option) or discard the last snapshot and
revert to the last but one (with the --all option).
8.12 VBoxManage openmedium / closemedium
These commands register or unregister hard disk, DVD or floppy images in VirtualBox.
This is the command-line equivalent of the Virtual Disk Manager; see chapter 3.5, The
Virtual Disk Manager, page 43 for more information.
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