[Yum] How to reinstall with yum?

[Alan Batie]

We've started using centos around here, and some "unfortunate incidents" 
recently have made us wish for the ability to force a reinstall without 
having to go through the pain of a complete wipe and install from 
scratch.  yum doesn't seem to have an option to do that.  If they were 
FreeBSD, I'd just check out a fresh copy and "make world", "but it's 
not!", so if anyone has suggestions for doing the equivalent, I'd 
appreciate it.  Thanks!
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