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Perform an install using a single codebase with symlinks to multiple install directories, each with separate LocalSettings.php, AdminSettings.php, and 
images and extensions directories as described here:

http://meta.wikimedia.org/wiki/MediaWiki_FAQ#Is_it_possible_to_install_more_than_one_wiki_.28MediaWiki.29_on_a_server.3F_How.3F

When performing an update to a new version, the maintenance/update.php script fails due to assumption that LocalSettings.php and AdminSettings.php 
are in the same root MediaWiki path as the update.php script.

The following is a unified diff of the changes that need to be performed to fix the file. This fix adds an additional --aconf command line option to specify 
the location of the AdminSettings.php file. Combined with the use of the existing --conf option, the update.php script will complete successfully.

--- commandLine.inc.original    2007-02-21 13:31:07.000000000 -0800
+++ commandLine.inc.new 2007-02-21 13:36:54.000000000 -0800
@@ -34,7 +34,10 @@
 if ( !isset( $optionsWithArgs ) ) {
        $optionsWithArgs = array();
 }
-$optionsWithArgs[] = 'conf'; # For specifying the location of LocalSettings.php
+# For specifying the location of:
+#  LocalSettings.php (conf)
+#  AdminSettings.php (aconf)
+$optionsWithArgs = array( 'conf', 'aconf' );
 
 $self = array_shift( $argv );
 $IP = realpath( dirname( __FILE__ ) . '/..' );
@@ -169,6 +172,11 @@
        } else {
                $settingsFile = "$IP/LocalSettings.php";
        }
+        if ( isset( $options['aconf'] ) ) {
+                $aSettingsFile = $options['aconf'];
+        } else {
+                $aSettingsFile = "$IP/AdminSettings.php";
+        }
 
        if ( ! is_readable( $settingsFile ) ) {
                print "A copy of your installation's LocalSettings.php\n" .
@@ -182,9 +190,9 @@
        require_once( $settingsFile );
        ini_set( 'include_path', ".$sep$IP$sep$IP/includes$sep$IP/languages$sep$IP/maintenance" );
 
-       if ( is_readable( $IP.'/AdminSettings.php' ) ) {
-               require_once( $IP.'/AdminSettings.php' );
-       }
+        if ( is_readable( $aSettingsFile ) ) {
+                require_once( $aSettingsFile );
+        }
 }
 
 # Turn off output buffering again, it might have been turned on in the settings files