How to Reset dbid from a Shell Script

I would like to use a shell script to:
1) Automate the restore of our Produciton backups to a different server
2) Reset the dbid prior to exiting the script
Is there a way to reset the dbid from a shell script?
When I use the following, it has an interactive prompt in the middle of it, and I don't see anything in the syntax diagram found in the "Oracle Database Utilities" manual that will let me get around this.
nid target =/
DBNEWID: Release 10.2.0.3.0 - Production on Fri Aug 8 09:37:04 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to database DRTEST (DBID=3725550444)
Connected to server version 10.2.0
Control Files in database:
/s01/oradata/drtest/control01.ctl
/s01/oradata/drtest/control02.ctl
/u01/oradata/drtest/control03.ctl
Change database ID of database DRTEST? (Y/[N]) => y
Proceeding with operation
Changing database ID from 3725550444 to 3752603328
Control File /s01/oradata/drtest/control01.ctl - modified
Control File /s01/oradata/drtest/control02.ctl - modified
Control File /u01/oradata/drtest/control03.ctl - modified
Datafile /s01/oradata/drtest/system01.dbf - dbid changed
Datafile /s01/oradata/drtest/undotbs01.dbf - dbid changed
Datafile /s01/oradata/drtest/sysaux01.dbf - dbid changed
Datafile /s01/oradata/drtest/users01.dbf - dbid changed
Datafile /s01/oradata/drtest/rman.dbf - dbid changed
Datafile /s01/oradata/drtest/temp01.dbf - dbid changed
Control File /s01/oradata/drtest/control01.ctl - dbid changed
Control File /s01/oradata/drtest/control02.ctl - dbid changed
Control File /u01/oradata/drtest/control03.ctl - dbid changed
Instance shut down
Database ID for database DRTEST changed to 3752603328.
All previous backups and archived redo logs for this database are unusable.
Database has been shutdown, open database with RESETLOGS option.
Succesfully changed database ID.
DBNEWID - Completed succesfully.

... When I use the following, it has an interactive
prompt in the middle of it, ...You may want to try out "Expect" for automating any interactive script.
isotope

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