Execute oracle commands with root login

I have oracle installed on a solaris system. Follwing is the problem we are facing and i couldn't find a good solution anywhere:

We need to execute some commands in oracle to take oracle database backups. For that it is required to be logged in as an oracle user. I want these backups to be automated and the most probable solution is using cron jobs. But the problem is that the oracle command which i want to execute under root login does not executed. Displays an error message for the command, because root does not have access to those commands. Is there a way to execute oracle commands without logging into oracle and without typing in password and simply execute as root. I will need a simple script file to do something like below
<All this is under root, the script file is stored under root>

su -oracle
<there is no prompt for password>
< backup command>
mailx -s "job done"

Does  su -oracle -c <backup command> work in this case?

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As root, 'su -oracle -c <backup command>' should work, provided that the <backup command> doesn't require a password.

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It should be:
    su - oracle -c <backup command>

    Need a WHITE SPACE between - and oracle.
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