yum repolist

The difference between yum.conf and yum.repos.d is
in earliar system yum.conf (/etc/yum.conf) was using, 
within a single file we have to configure everything it was very 
congesting so now what they did is, they created several repo files, 
instead of one repo file and all the repos are kept under 
/etc/yum.repos.d/ directory.

Run as root
If you are in Gnome nautilus /etc/yum.repos.d
If you are in KDE dolphin /etc/yum.repos.d
If you are in XFCE thunnar /etc/yum.repos.d
If you are in LXDE pcmanfm /etc/yum.repos.d
If you are in Mate caja /etc/yum.repos.d
And the delete the .repo file than coresponding to the repo you want to disable

yum repolist

yum repolist enabled

shows all enabled repositories. These two commands are identical.

yum repolist disabled

shows disabled repositories.

yum repolist all

shows everything.

rpm -qa | grep adobe-release

Then use yum to remove it.

yum remove <adobe-release-name>

yum-config-manager repository 

Add Repo 

yum-config-manager --add-repo=http://download.fedoraproject.org/pub/fedora/linux/updates/testing/20/$(uname -p)/
 

CLEANNING

rm -f /var/lib/rpm/__*

rpm --rebuilddb -v -v

yum clean all