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Upgrading joomla to the latest version is very easy

1. Download the patch to the current stable version (joomla download page)
2. Unpack the patch
3. Upload the patch to your server overwriting old files

Few days ago Joomla has been updated to version 1.5.10 because of some security vulnerabilities.

Upgrading to Joomla 1.5.10 from Joomla 1.5.9 is straightforward, the required patch is 1.5.9 to 1.5.10 Upgrade Package

Upgrading Joomla 1.5 for multiple websites

My problem was upgrading 20 joomla installations automatically, not manually.

Each website has the Joomla SEO Patch, which has to be upgraded too, after the Joomla core upgrade.

I created a bash script to do everything automatically.

I use this directory structure for my websites: every domain is linked to a directory of my dedicated server, located in /var/www/websites

So I have

/var/www/websites/site1.com

/var/www/websites/site2.com

…

/var/www/websites/site20.com

I downloaded the 1.5.9 to 1.5.10 Upgrade Package to /root directory, I unpacked it using the command unzip Joomla_1.5.9_to_1.5.10-Stable-Patch_Package.zip in the directory /root/PATCH-1.5.9–1.5.10

I also downloaded the Joomla 1.5.10 SEO PATCH and unpacked it into the directory /root/PATCH-SEO

The script for a Joomla automatic upgrade is the following

cd /var/www/websites

for F in `ls -1`; do chattr +i $F/robots.txt; chattr +i $F/.htaccess; done

for D in `ls -1`; do cp -r /root/PATCH-1.5.9–1.5.10/* $D ; done

for D in `ls -1`; do cp -r /root/PATCH-SEO/* $D ; done

The first line changes your CWD (current working directory)

The second makes your robots.txt and .htacces immutable, thus avoiding overwriting.

The third line patches Joomla

The last line applies the Joomla Seo Patch

Have fun

BE CAREFUL, those commands worked for my dedicated server, your configuration and/or installation paths and versions will probably be different!!!