OEL5 : how to add public YUM server

Steps to install public YUM server in your Oracle installation.
either if they are Enterprise Linux, RedHat or just use RPMs.

Example for Enterprise Linux 5:

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

Open the yum configuration file in a text editor:
vi public-yum-el5.repo

Change enabled=0 to enabled=1 from the repository you need.

Go to http://public-yum.oracle.com/ for complete instructions on other Linux versions.

Now we can try it!
yum list
yum install firefox