Using /testfor in minecraft to check if a player has a certain item in their inventory

I am wondering how I can use the /testfor command in Minecraft 1.8+ to check whether a certain player (For example the nearest player to a command block) has a number of items.

For example, if a player pushes a button, this causes a command block to check if they have 10 iron ingots. If they do, the command block outputs a signal to another command block that takes 10 iron from them and gives them a diamond, making a simple shop.

IS this possible? If it is, could someone reply with the commands, as I am not very good with redstone. Thanks :)

minecraft-java-edition minecraft-commands

Best Answer

If you do these setup commands:

/scoreboard objectives add items dummy

/stats entity @a set AffectedItems @p items

/scoreboard players set @a items 0

Then run this command: (N.B. The execute is ESSENTIAL)

/execute @a ~ ~ ~ /clear @p minecraft:iron_ingot 0

This will then mean that each player has the number of iron ingots in their inventory as their items score. This will allow you to process the event you need

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Answer 2

In 1.9/1.10: Make a repeating command block, needs redstone, that does:

/clear @p minecraft:(currency)

Replace "(currency)" with your currency in your example iron ingots. So do:

/clear @p minecraft:iron_ingot 0 1

Replace the 1 with however many you need to buy the second item, so 10. Now, place a conditional chain command block facing away from the repeating. Put:

/give @p minecraft:(bought item)

Replace bought item with the bought item, so diamond. Now however many, so 1. Then put 0. And you're done!

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Images: Anna Shvets, Andrea Piacquadio, RF._.studio, Field Engineer