A product status of "0" (zero) will show the product as "Out of Stock" (depending also, on some stock status settings in admin panel).
You can "update" this status using SQL commands via SQL injections in the TOOLS menu of your admin:-
EG
Code:
UPDATE `products` SET `products_status` = '0' WHERE `products`.`products_id` =13455;
UPDATE `products` SET `products_status` = '0' WHERE `products`.`products_id` =21405;
UPDATE `products` SET `products_status` = '0' WHERE `products`.`products_id` =43252;
UPDATE `products` SET `products_status` = '0' WHERE `products`.`products_id` =12459;
UPDATE `products` SET `products_status` = '0' WHERE `products`.`products_id` =55434;
The products ID is the zencart-attrributed ID.
Some years ago I found a developer who wrote a module to take a supplier's data feed and (in essence) do these "update" commands using CRON. At the time, our supplier FTP'd the stock status file to our server at midnight. The script ran (using CRON) at ten past midnight.
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