Since you didn't post your OS and version, I am assuming Solaris and 8.1.7.2.

You can use cron to automatically kick off a script.

Inside your script, you will run rman from the command line similar to:
rman catalog rmanuser/rmanuser@rcvcat target / cmdfile=your_command.rman msglog=backup.out



[Edited by marist89 on 01-22-2002 at 04:38 PM]