I would like to upgrade Magento 1.5 to 1.6 and NOT to the latest (1.7) version.
I think I need to change something in this line, but I don't know what:
./mage install http://connect20.magentocommerce.com/community Mage_All_Latest --force
I use this:
find . -type f -exec chmod 777 {} \;
find . -type d -exec chmod 777 {} \;
rm -rf var/cache/* var/session/*
chmod 550 ./mage
./mage mage-setup .
./mage config-set preferred_state stable
./mage list-installed
./mage list-upgrades
./mage install http://connect20.magentocommerce.com/community Mage_All_Latest --force
php shell/indexer.php reindexall
find . -type f -exec chmod 644 {} \;
find . -type d -exec chmod 755 {} \;
Do you have experience using Subversion? If you do, take a look at http://www.magentocommerce.com/svn.
Make sure you backup your files AND database first (just in case). This may take a couple of tries to get right.
What you want to do is checkout the 1.6 branch into your Magento folder:
svn checkout http://svn.magentocommerce.com/source/branches/1.6 /var/www/magento
The above assumes your Magento folder is /var/www/magento, otherwise replace the path with what makes sense for your environment.
Once you've got subversion working, it is easy to view changesets between versions with the svn diff command. But, if you're worried about changes in this upgrade, you can checkout the 1.6 version to a temporary folder, and view all the changes with a tool like diff:
svn checkout http://svn.magentocommerce.com/source/branches/1.6 /tmp/magento-1.6
diff -Naurw /var/www/magento /tmp/magento-1.6 | vim -
That will load the diff output into vim, where you can have nice syntax highlighting to make your eyes bleed less! You should be prepared for this to take a while, especially when going between major versions like 1.5 and 1.6.