Only 4 commands for this one, very easy:
/shop list [page number] = lists all items for sale/purchase
/shop check [name] OR /shop check [id] = checks price of item
/shop sell [name OR id] [amount] = sells a certain amount of an item
/shop buy [name OR id] [amount] = buys a certain amount of an item
Examples:
/shop check log = finds prices for logs
/shop sell log 3 = sells 3 logs
/shop buy log 3 = buys 3 logs
OR use ID's (ID for log is 17)
/shop check 17 = finds prices for logs
/shop sell log 17 = sells 3 logs
/shop buy log 17 = buys 3 logs
http://www.minecraftwiki.net/wiki/Dat...