Automatically updates the TYPO3 CMS core to its latest minor release if these criteria are met:

• It only works under Unix and MacOS (support of symbolic links is required).
• typo3_src must be a symbolic link to the extracted TYPO3 source directory.
• The symbolic link needs to be writable (and deletable) by the web server user.
• The document root directory needs to be writable.
• One path above document root (../) needs to be writable (new directories will be created).
• The tar command must be available for extracting the TYPO3 source package.