Command block check chest

Question

I want to make a shop where the player must hold a item and then click a button, and what I want to do is a "test for" like command to check if the item in the players hand matches the item in slot 0 in the chest. Is there a way to do that thanks.

or I could just check if the item is in the players inventory. :)

Answer 1

You cannot compare the two items in the sense of

Chest == Hand

However you can do something more like

Chest == X and Hand == X therefor Chest == Hand

You can check what is in the hand using {SelectedItem:{Item Tag}} (see more at http://minecraft.gamepedia.com/Player.dat)

Answer 2

No, you cannot compare items in inventories. You probably want to check for the specific item in the command.