/For=ForVolumeSpec /Oldest /Quiet %1 %2 /Shadow=ShadowId /Quiet %1 %2 /All - For the given ForVolumeSpec deletes all matching ...

%1 %2 /For=ForVolumeSpec [/Oldest] [/Quiet] %1 %2 /Shadow=ShadowId [/Quiet] %1 %2 /All     - For the given ForVolumeSpec deletes all matching shadow copies.       If /Oldest is given, the oldest shadow copy on the volume is deleted     If /All is given, then all shadow copies on all volumes that can be      deleted will be deleted.  If /Shadow=ShadowId is given, the shadow copy      with that Shadow Copy ID will be deleted.  Only shadow copies that have      the ClientAccessible type can be deleted.     - The Shadow Copy ID can be obtained by using the List Shadows command.     When entering a Shadow Copy ID, it must be in the following format:        {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}      where the X's are hexadecimal characters.  This ID can be obtained      through the List Shadows command.      Example Usage:  vssadmin Delete Shadows /For=C: /Oldest