LINUX How to Disabling / Enabling Yum Repository

To add such a repository to your system and enable it, run the following command as root:
yum-config-manager --add-repo repository_url
Example
yum-config-manager --add-repo http://www.example.com/example.repo 
To enable a particular repository or repositories, 
type the following at a shell prompt as root:
yum-config-manager --enable repository…
Example
yum-config-manager --enable example
To disable a Yum repository, run the following command as root:
yum-config-manager --disable repository…
Example   
yum-config-manager --disable example

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