How i can force purge in Live Update Administrator in command line

Hello,

     We use LUA for Download SEP 11 virus definitions.

     In some LUA, programmed purge never work fine and some LUA have double in "Used By Updates".

     LUA are all  V 2.3.2.99.

     Existe a way to force in command line Update purge for :

     "Purge updates in Manage Updates folder" & "Purge updates in Distribution Centers"  ?

Best Regards