Pando, I think that now I understood you.
I rename the oraenv,coraenv and dbhome files to oraenv_oas,coraenv_oas and dbhome_oas from OAS $ORACLE_HOME and change the references on the root.sh script and it's work.
I had some problems on the installation because I didn't complete all the S.O. requirements.
I will reinstall the Fedora Linux and install everything again.
I have the ORACLE DATABASE 10g, DB2 DATABASE V9.1 and now I will install the Oracle Application Server 10g.
I prefered to resintall everything againg to practise and see if it will work.

I will post the results.
Thank you for the idea.

Note: My apologizes if I wrote anything wrong.
I am from Brazil and my english is not very well, but I believe that you understood me.