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To exclude files/folders when archiving using tar in linux, use the following command:-

tar -czvf filename.tar.gz --exclude 'path1/*' --exclude 'path2/*' --exclude 'path3/*' folder_or_files_to_be_archived

References:-
http://www.wallpaperama.com/forums/how-to-exclude-a-directory-in-a-tar-l...
http://www.cyberciti.biz/faq/exclude-certain-files-when-creating-a-tarba...
http://www.linuxtopia.org/online_books/linux_tool_guides/tar_user_guide/...

The problem:
We needed to use different log4j.properties file for each context.

We have one library (directory.jar) which resides in tomcat's shared lib that uses log4j. We also have three contexts (core, admin & user contexts) that will be using log4j for logging too.

Initially, we put the log4j library in tomcat's shared lib, and specify log4j.properties for each context's web.xml. But we found out that only one context is able to initialize the log4j properly. The other two contexts doesn't seem to be able to use log4j properly.

If you have the problem of not being able to see the Blog Module page after enabling it, and you are using Clean URL for your site, then it's *probably* because you have accidentally created a subdomain with the name 'blog' (e.g. http://blog.example.com), or you have a subdirectory named 'blog' on your website's root folder (www, htdocs or public_html). You should be able to see Drupal's Blog Module after you remove the subdomain / subdirectory with that same name.

Quick HOWTO to enable Virtual Hosts with XAMPP on Ubuntu (or any *nix distribution).

shell> sudo gedit /opt/lampp/etc/httpd.conf

Include etc/extra/httpd-vhosts.conf

shell> sudo gedit /opt/lampp/etc/extra/httpd-vhosts.conf

NameVirtualHost *:80

<VirtualHost *:80>
    ServerAdmin admin@localhost

I'm sorry for the inconvenience caused. Most of the resources you're trying to look for are not available. My previous hosting provider recently had a major server breakdown, causing all data to be lost. I will try my best to get the posts back up as soon as possible.