BUY

Also: SELL

Syntaxtalk shopkeeper helptalk shopkeeper sell itemtalk shopkeeper appraise itemtalk shopkeeper buy itemtalk shopkeeper listtalk shopkeeper hours

When you find a shopkeeper, you can interact with it in several ways. These are listed below:

help: just lists the various things you can talk to the storeowner about.
sell: sells an item to the shopkeeper.
appraise: values an item... how much the shopkeeper is willing to pay you.
buy: buys an item from the shopkeeper.
list: lists the items the shopkeeper has to sell, along with its price.
hours: tells you the hours that the shopkeeper is open for business.