If you are using Fedora 22 or later, where dnf has replaced yum as the default package manager, then you can use this command taken from here:

dnf config-manager --add-repo repository_url

where repository_url is a link to the .repo file.

And you can enable it by:

dnf config-manager --set-enabled repository

where repository is the unique repository ID.

If you are using Fedora 22 or later, where dnf has replaced yum as the default package manager, then you can use this command taken from here:

dnf config-manager --add-repo repository_url

where repository_url is a link to the .repo file.

And you can enable it by:

dnf config-manager --set-enabled repository

where repository is the unique repository ID.