POS收银机销售系统功能包括：收银，挂单，取单，退货，对商品，账户的维护，查询销售记录等。 -POS cash register sales system features include: cash register, lodging take orders, returns, commodities, account maintenance, check sales records.

Linux下c描写的 简易销售监控系统，以菜单的形式进行管理，包括商品的增删改查等。-Simple sales monitoring system under Linux c descr iption to the menu in the form of management, including commodity CRUD.