Command Block – Minecraft Wiki

A command block is a block that can execute commands. Because it cannot be obtained or edited in Survival mode without cheats, it is primarily used on multiplayer servers, in Creative worlds, and custom maps. An impulse command block is the default block type; it executes only once when activated. A chain command block executes every time when triggered. A repeating command block executes every game tick as long as it is activated. In Java Edition, command blocks are available in the Creative in

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Command Block - Wiki Guide

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Command Block – Minecraft Wiki