yum update

[root@localhost yum.repos.d]# yum repolist
Loaded plugins: product-id, refresh-packagekit, replace, security, subscription-
              : manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
repo id         repo name                                                  status
epel            Extra Packages for Enterprise Linux 6 - x86_64             11,141
ius             IUS Community Packages for Enterprise Linux 6 - x86_64        232
ius-dev         IUS Community Packages for Enterprise Linux 6 - x86_64 - D     25
pgdg93          PostgreSQL 9.3 6Server - x86_64                               256
rpmforge        RHEL 6Server - RPMforge.net - dag                           4,718
slc6-devtoolset Scientific Linux CERN 6 (SLC6) - Devtoolset addons            458
slc6-os         Scientific Linux CERN 6 (SLC6) base system packages         6,673
webtatic        Webtatic Repository 6Server - x86_64                          383
repolist: 23,886