Eject Number | DeviceName | VolumeName

The eject utility ejects the disk in the specified device number, device name,
or volume name.  If specifying the device number, it must be specified as a
number only.  When specifying the device name, the name must be preceeded with
a "." character. When specifying the volume name, the name must be a valid
GS/OS volume name (i.e. it must start with a '/' or ':').
