HP 3000 Manuals

Message Catalogs:Programmer's Guide

Rolling Back to the Old Source File 

After creating a new source file by merging an old source file with a
maintenance file, you may want to return to using the old source after it
is no longer available.  To rollback to the old source, use a collision
file, as shown in Figure 4.4.

Collision files are created at your option when GENCAT merges source and
maintenance files.  A collision file contains the changes that were made
to an old source.  A collision file's contents depends on the source and
maintenance files and the method used of merging.  Unlike a maintenance
file which contains information to change the old source into the new
source, a collision file contains information to re-create the old source
from the new source.  To rollback to the previous version of the source,
the collision file is merged against the new source with the same merging
method that was used to create it.


          Figure 4.4.  Rolling Back to the Old Source Catalog

MPE/iX 5.0 Documentation