Very easy:
mysqldump --single-transaction -uUSER -pPASSWORD DATABASE TABLE cms_block --where="block_id in (select block_id from cms_block_store where store_id=4)"
Very easy:
mysqldump --single-transaction -uUSER -pPASSWORD DATABASE TABLE cms_block --where="block_id in (select block_id from cms_block_store where store_id=4)"