Go to the Shell folder
cd root_folder/shell
To execute full reindex, use the below command
php -f indexer.php reindexall
Commands for individual reindexes are given below
php indexer.php --reindex catalog_product_attribute php indexer.php --reindex catalog_product_price php indexer.php --reindex catalog_url php indexer.php --reindex catalog_product_flat php indexer.php --reindex catalog_category_flat php indexer.php --reindex catalog_category_product php indexer.php --reindex catalogsearch_fulltext php indexer.php --reindex cataloginventory_stock php indexer.php --reindex tag_summary
Cheers
Amjath