/clear

Removes items from a player's inventory. Can target specific items and limit how many are removed.

Syntax

/clear [<targets>] [<item>] [<maxCount>]

Name	Type	Required	Description
targets	entity	Optional	The player(s) whose inventory to clear. Defaults to the executing player.
item	item_predicate	Optional	The item to remove. If omitted, all items are cleared.
maxCount	integer	Optional	The maximum number of items to remove. If 0, counts matching items without removing them.

/clear @p

Clears the entire inventory of the nearest player.

/clear @a minecraft:dirt

Removes all dirt blocks from every player's inventory.

/clear @s minecraft:diamond 0

Checks how many diamonds the executing player has without removing any (useful in command blocks).

Forgetting that maxCount 0 tests for the item but does not remove it, useful for detection but surprising if you expected deletion.
Not specifying an item when you only want to remove a specific type, omitting the item argument clears the ENTIRE inventory.

When maxCount is 0 the command succeeds if the player has the item but removes nothing. This is useful for testing in conditional command blocks.

/give/item/replaceitem

Try these commands on Astroworld or host your own server.