Upgrade from moodle 1.8 to 1.9 (with Nwiki upgrade)

A very quick howto to upgrade moodle 1.8 to moodle 1.9 (with Nwiki upgrade from 1.8 to 1.9):

1. Stop your moodle 1.8 (mantainence mode)
2. Copy your moodle DB (ispconfig is great for this) to a new one (here is dbmoodle19)
3. Copy your Moodle 1.8 code to the directory where you'll be installing 1.9: cp /var/www/path2moodle18 /var/www/path2moodle19
4. Switch to the 1.9 directory and get the new version of Moodle: cd /var/www/path2moodle19 | wget http://download.moodle.org/stable19/moodle-weekly-19.tgz
5. Un-compress the new Moodle 1.9 files: tar xvzf moodle-weekly-19.tgz
6. Move the files from the moodle subfolder into your 1.9 folder: cp moodle/* . -a
7. Remove the now-empty Moodle folder: rm moodle -Rf
8. Review your config.php: vim /var/www/path2moodle19/config.php (dbusers | dbtables | urls | paths)
9. Visit your new Moodle to start the upgrade to 1.9 process: http://www.yoursite.net/moodle19
10. Follow the wizard and congratulations: your moodle is now 1.9 !!
11. Download nWiki 1.9 and upload to your server: http://morfeo.upc.es/crom/mod/resource/view.php?id=268
12. Unzip & copy to your moodle root.
13. Visit your moodle notifications page and follow the wizard.
14. Congratulations your Nwiki is also updated.