[Yum] basic question? - yum update security

[Peter Glassenbury (CSSE)]

I am running a fedora 12 department of many machines.
We don't update everything daily in case some of the local stuff
breaks with a general fedora yum update.

We would, however, like to rollout the security patches.

Can someone tell me is there a "yum update securitypatches" style
command or is it a "run yum one by one" system that we should run
on each package we get a security notification for.

I ask this because it was noticed locally that the Gnome
interface to PackageKit seemed to know which packages were security
updates and which were just general updates so the knowledge is
obtainable automatically by some programs. Is that information available
to yum(our preferred method of deployment)?

Cheers
Pete

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Peter Glassenbury			Computer Science department
pete at cosc.canterbury.ac.nz		University of Canterbury
+64 3 3642987 ext 7762			New Zealand