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Check if player has an item in Minecraft and if so remove it

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gionna last edited by

I am creating a server where a certain item is banned. How do I get to know if a player has it in their inventory, and, if so, how can I delete all instances of it using command blocks?
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Pearlaqua last edited by

You can use the https://minecraft.fandom.com/wiki/Commands/clear command.

Example:

/clear @a minecraft:flint_and_steel

@a is a https://minecraft.fandom.com/wiki/Target_selectors which selects all players. You can supply any item ID instead of minecraft:flint_and_steel. The Minecraft wiki should tell you the ID of any item on it's page. For example, see the https://minecraft.fandom.com/wiki/Sword?so=search#ID page for all the different sword IDs.

Because you need this to execute every tick, make sure this Command Block is set to "repeating" mode. Otherwise, it will only clear the items once.
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This is some very interesting behaviour that I found out while answering this question. I'd like to share my findings in this post. Let it be a guide for using NBT. Consider a simple CanDestroy statement. When you think of it, it looks like this: /give @s minecraft:diamond_pickaxe{CanDestroy:["minecraft:dirt"]} But some posts don't have the quotes around the value. Try out their commands, for example: /give @s dirt{CanDestroy:[dirt]}. Does it work? Surprisingly, yes. Apparently, you don't need need to type the surrounding quotes if your string only consists of the following characters (whitespace not included): +-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz The one exception is if the entry is treated as a number, which would count for entries like 12b,512s, and 82664. But if the number is formatted incorrectly and would fit into the above category of quoteless strings, it will, even if you don't want it to. The following number lookalikes will becomie strings: Numbers with leading zeros: (012b, 04582s) To solve, remove leading zeros from your numbers: (12b, 4582s) Numbers outside the range of your data type: (255b, 2177548418058) To solve, ensure the correct data type is specified: (255, 2177548418058l)
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If you are trying to create an End Portal in Creative Mode, you must surround the sides of an empty 3 by 3 square with End Portal Blocks, then fill all of them with Eye of Enders. You don't need the portal blocks at the corners, it just looks nicer. The last Eye of Ender placed must be facing IN the portal. To add on to what kyr said, when you find the End portal in the stronghold, you still have to fill the portal blocks with Eye of Enders with the last one facing the inside of the portal.
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I'm not really a Minecraft player, but a quick glance at the wiki indicates that you should (like with other metals) first smelt raw gold ore in to Gold Ingots, using a furnace. These ingots can then be used to craft weapons and armour (which you don't want), but also used to create Clocks and Powered Rail. You can also combine 9 ingots in to a Gold Block, these can then be used for construction (if you want a nice golden house or something) or these ingots can then be used to craft a Golden Apple, which instantly restores your health. Given the supposed rare nature of Gold within the game and the items you can create with it, I would presume Gold's most important usage is in the creation of Powered Rail, which (from what I see here) vastly increases your construction options with mine carts.
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You are very close. More magic from /execute can split each player's handling to themselves. Using scoreboard tags, we can then target the players individually. execute as @a # Tell all players to do the following: if data entity @s {Inventory:[{id:"minecraft:diamond",Count:5b}]} # If I have 5 diamonds, continue, otherwise stop. run tag @s add diamondBow # give myself a recognizable tag. Then, just run the following in order: clear @a[tag=diamondBow] minecraft:diamond 5 # Clear the diamonds give @a[tag=diamondBow] minecraft:bow # Give the bow give @a[tag=diamondBow] minecraft:arrow # Give the arrow tag @a[tag=diamondBow] remove diamondBow # Get rid of the tag Note that in order to work, all 5 diamonds must be stacked in one slot, not spread out through the inventory. If you want to detect 5 diamonds spread out anywhere in the inventory, replace the /execute command with the following two: /execute as @a store result score @s itemsCleared run clear @s minecraft:diamond 0 /tag @a[scores={itemsCleared=5}] add diamondBow
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The main problem with your command is that you have an extra set of square brackets after SelectedItem; that is, ...SelectedItem:[{id:"mi... should really be ...SelectedItem:{id:"mi... A square bracket [ tells Minecraft that the specified tag is a list (for example ArmorItems:[{},{},{},{}]), where as a curly bracket { tells Minecraft that the specified tag is a single item (with attributes). I'm assuming that you should also use an at @s to tell Minecraft to run at the player's coordinates and specify the block you want to fill. This turns out as /execute as @a[nbt={SelectedItem:{id:"minecraft:grass_block",tag:{display:{Name:"{\"text\":\"GRASS3x3\"}"}}}}] at @s run fill ~-1 ~-1 ~-1 ~1 ~-1 ~1 grass_block
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