Just upgraded this blog to WordPress 2.6.1 via ssh. Went just fine (knock on wood). Here’s the commands I used, for my own reference as much as anyone else’s:
wget http://wordpress.org/latest.tar.gz rm -rf wp-includes rm -rf wp-admin tar -xzvf latest.tar.gz cp -rpf wordpress/\* . rm latest.tar.gz
Of course, you’ll want to replace “.” in the second-to-last line with the address of your wordpress directory. In my case, I use the root directory.
UPDATE: Another tip I thought of to make this process even more streamlined: paste all of the above commands into a text file and call it “wp-upgrade” or something like that. Then type in:
chmod 755 wp-upgrade
That will make the file executable. From then on, all you have to do to upgrade WordPress is type