MediaWiki directory structure

The directories that the MediaWiki installation bring look like this:

/etc/mediawiki
/usr/share/doc/mediawiki
                |-- docs
                |   |-- html
                |   `-- php-memcached
                `-- examples
/usr/share/mediawiki
           |-- includes
           |   |-- api
           |   |-- cbt
           |   |-- filerepo
           |   |-- media
           |   |-- normal
           |   |-- templates
           |   `-- zhtable
           |-- languages
           |   |-- classes
           |   `-- messages
           |-- maintenance
           |   |-- archives
           |   |-- dtrace
           |   |-- language
           |   |-- ora
           |   |-- postgres
           |   |   `-- archives
           |   `-- storage
           `-- skins
               |-- chick
               |-- common
               |   `-- images
               |       `-- icons
               |-- disabled
               |-- modern
               |-- monobook
               |-- myskin
               `-- simple
/var/lib/mediawiki
         |-- config
         |-- extensions
         `-- images\

As soon as you install package mediawiki-extensions, you'll also get these directories:

/etc/mediawiki-extensions
     |-- extensions-available
     `-- extensions-enabled
/usr/share/mediawiki-extensions/
           `-- maintenance

Under Debian, the directory trees have their own specialized purpose:

• /etc/mediawiki contains the configuration files for MediaWiki
• /etc/mediawiki-extensions contains the configuration files for the MediaWiki extensions of the mediawiki-extensions package, and of all extensions that we install by hand (if we follow some simple guidelines described elsewhere in this Wiki)
• /usr/share/doc/mediawiki contains the documentation files
• /usr/share/mediawiki contains the source code. It is not used directly, rather it is linked to from the /var/lib/mediawiki directory
• /usr/share/mediawiki-extensions contains the source code for the extensions from the mediawiki-extensions package (and we'll manually install extensions there as well).
• /var/lib/mediawiki contains the site, including links to the configuration files in /etc/mediawiki