Which software do you use to keep track of visitors to your site (especially UMV)?
Does anyone use Google Analytics?

I want to find one that I can just put either on the server or on one page if possible, but that will be able to tell me about my whole site.

Or, if nothing else, one where I can just put the same coding on all of the pages, not all different coding. Page views would also be nice.

It doesn't have to be free, but cheap would be good.

Also, has to be something I can use on my existing sites, with my current host, not requiring me to move. I believe we have a Unix server so it has to be something that will work on that.

I'm not a coder so keep it simple.