DD-MVS alternate DD names

There are three DD-MVS Alternate DD Names process statements:

NEWDD: Name applies to the new (or search) file
OLDDD: Name applies to the old file
UPDDD: Name applies to the update file

These process statements allow you to specify alternative names for the new and old input files, and for the output update file. (The default names are NEWDD, OLDDD, and UPDDD.)

Compare Types: FILE, LINE, WORD, and BYTE. NEWDD is also valid for Search.


>>-+-NEWDD-+--DDname-------------------------------------------><
   +-OLDDD-+           
   '-UPDDD-'

DDname: The name of the DD card to be processed.

Example	Description
`UPDDD FILE3`	Update file is referecenced via DD card with the name FILE3.
`NEWDD FILE4`	Name of new file DD is FILE4.