$TRUNCATE

   The Truncate service shortens a sequential file.

                        RAB64 USERS (ALPHA ONLY)

      On Alpha systems, RAB64 can replace the RAB or RAB prefix
      wherever it is used with the Truncate service on OpenVMS
      Alpha systems.

   Format

     SYS$TRUNCATE  rab [,[err] [,suc]]
 

Additional information available:

Returns         Arguments       Condition_Values_Returned