Command Block

A Command Block is a special kind of block which can be activated to run a Minecraft command. When combined together in chains or as part of redstone contraptions, these can be used to create simple or complex systems. Many of Zedwork's custom ZestyGames run on Command Blocks

Usage

There are 3 types of command block:

Impulse: When powered this Command Block will run its command, and all those in the chain following it, once per activation.
Chain: This special Command Block does not run on its own, but will run its command when activated as part of a chain of Command Blocks.
Repeating: When powered this Command Block will run its command, and all those in the chain following it, 20 times per second.

Tutorials

The command block tutorial page has some hopefully helpful tutorials for people wanting to use command blocks. Some of these tutorials are listed here.

Holograms with Command Blocks Tutorial

Trash Item Removal Tutorial

Update Commands From 1.9/1.10 To 1.11 Tutorial

Commands

The following commands are available for use in Command Blocks:

Command:achievement

Give/take an achievement to/from a player.

Command:blockdata

Modifies the data tag of a block.^[1]

Command:clear

By default will clear all items from a player's inventory. Can also clear specific items when using optional arguments.

Command:clone

Copy the blocks and entities from within the selected area to the specified destination.

Command:defaultgamemode

Sets the default gamemode (Survival, Creative, Adventure or Spectator) a player will be in when joining a server for the first time.^[2]

Command:difficulty

Sets the server's difficulty level.

Command:effect

The effect command manages status effects on players and other entities.^[3]

Command:enchant

Adds an enchantment to a player's selected item, subject to the same restrictions as an anvil.^[4]

Command:entitydata

Modifies the data tag of an entity.^[5]

Command:execute

Executes a command on behalf of one or more other entities, with originating permissions, optionally on condition that a single-block /testforblock-style check ^[6]

Command:fill