YUM REPO
To list only enabled repos, enter:
# yum repolist enabled
To list only disabled repos, enter:
# yum repolist disabled
To list all repos (default), enter:
# yum repolist all
To list available packages under a repo called ksplice-uptrack, enter:
# yum --disablerepo="<repo name>" --enablerepo="<repo name>" list available