Stephen_Isard wrote
> Hope that's helpful.

It was very helpful, thank you. The info you cited seems true for SL5,
though; SL6 appears quite different. In SL6,

root@vm-37-00> rpm -ql yum-autoupdate
/etc/cron.daily/yum-autoupdate
/etc/sysconfig/yum-autoupdate

Whereas yum-cron contains many more config files & etc, has to be 
chkconfig'd on, etc. 
yum-autoupdate config file has an exclude line in it; yum-cron's doesn't.

So it looks like for simplicity & functionality, yum-autoupdate on SL6 
gives what's wanted - can exclude things, get the daily automatic update, 
& much less config cruft.

Thank you for your help.