I import more than 2000 products in magento but I have a problem, I don't know what is the reason but now at the end of each sku appear
_1 is there any way to remove this for all skus?
The quick and dirty way would be just to run this sql query on your database.
UPDATE catalog_product_entity SET sku = CONCAT(LEFT(sku, CHAR_LENGTH(sku) -2), '') WHERE sku LIKE '%_1';
You can add a
where condition if you need it for a certain group of products.