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goto your magento/shell folder with root or sudo access
php indexer.php //Displays help information on how to use the script
php indexer.php --status //Shows the status of all the indexes
php indexer.php info //Shows the “codes” for the individual indexes
php indexer.php --reindex <code> //Re-indexes the <code> index
php indexer.php reindexall //Re-indexes all the indexes