Well Ken, yes, only once. I will probably run it again at the end of my semester. Yep, Wow!
I am still a novice at these server things, so I am always cautious not to break anything. On the other side of this, I do regularly (about every 3-4 weeks) update my Moodle.
I did the "cat" command, and found that I have "CentOS release 6.6 (Final)".
I am making sure to add this yum update high on my list of things to do at the end of the semester. Thanks for mentioning it to me.