At least 4... there is also PackageKit-cron , which does essentially the same thing in a slightly different way. Bng On 07/13/2012 11:59 AM, Konstantin Olchanski wrote: > In the SL/SLC 5/6 world there are 3 nightly update scripts: > > yum.cron - is now part of the yum package (so count it as "standard", file bugs at bugzilla.redhat.com) > yum-autoupdate-2 - comes with SL (written by Troy?) (complain to this list) > yum-autoupdate-4 - comes with SLC (written at CERN?) (complain to CERN)