In case you need to install some Oracle rpm for compatible OS like Centos, RedHat or for Oracle Enterprise Linux just do following steps:

Enterprise Linux 5

Download repository configuration file

cd /etc/yum.repos.d
wget http://public-yum.oracle.com/public-yum-el5.repo 

once it’s done enable repository that you need

 vi public-yum-el5.repo
 Change enabled=0 to enabled=1 from the repository you need.

Enterprise Linux 6

Oracle Linux 6

cd /etc/yum.repos.d
wget http://public-yum.oracle.com/public-yum-ol6.repo 

once it’s done enable repository that you need

 vi public-yum-el6.repo
 Change enabled=0 to enabled=1 from the repository you need.

Verify it works

yum list
yum install firefox

More information on http://public-yum.oracle.com/

Have a fun 🙂

Tomasz