[CentOS] Are these steps for re-installing Gnome correct/safe?

Wed Aug 17 15:40:22 UTC 2005
Dave Gutteridge <dave at tokyocomedy.com>

>Try running 'rpm -Va' to find out what on your system has changed from
>the default somehow.
>
This produced a zillion results which scrolled of the screen and I 
couldn't scroll back to see them all. What do I do with the results of 
this command?

Dave