As I didn't easily find a simple and short upgrade instruction to install a simple security upgrade, I'm documenting here what I do to run my current security upgrade from what I guess should be the easy and correct way...

It's what I just did to get from drupal 6.8 to 6.9 - so it's about a minor / security upgrade.

I'm assuming all the steps are made on a testing setup first, and the effect is checked there, first, before it's deployed to the live system!

• rename the old cms dir on my webserver - mv cms cms-6.8
• unpack the new package into the cms dir - tar xvfz drupal-6.9.tar