Command Block

“	If you mostly play survival mode, and you're thinking "that sounds a lot like cheating", then you're right – which is why command blocks aren't available in survival mode. They're a feature that we built specifically for creative mode, and for adventure mode mapmakers. Jeb announced their existence in a tweet in July 2012, and they were added to the game in version 1.4.2 – the Pretty Scary Update, which also added spooky anvils, creepy flowerpots and terrifying carrots on sticks.	„
	~ Duncan Geere talking about Command Blocks

Background

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 and in custom maps.

Command Blocks are not available in the Creative inventory. It can either be obtained by using the pick block control, or by using various commands, such as /give @s command_block, or /setblock ~ ~ ~ minecraft:command_block.

Just like other blocks that can store NBT data, using pick block + CTRL copies the command and options inside the Command Block. This allows it to be placed elsewhere without having to re-enter the data inside.

Command Blocks also cannot be broken in Survival mode without operator permissions, are not flammable, cannot be moved by pistons, and have the same blast resistance as bedrock.

Powers and Stats

Tier: Unknown

Name: Command Block, Chain Command Block, Repeating Command Block

Origin: Minecraft

Age: Unknown

Classification: Block, Machine

Wielders: Minecraft Story Mode characters

Attack Potency: Unknown (Can destroy bedrock or other Command Blocks)

Dimensionality: 3-D

Travel Speed: Immobile

Combat Speed: Immeasurable (Can instantly affect all of reality)

Durability: Unknown (Can tank explosions of this level)

Range: Low Multiversal (Can affect the Nether and the End with commands)

Powers and Abilities: Power Bestowal and Nullification (/ability can grant or revoke abilities from other players), Void Manipulation (/difficulty can change the difficulty of the game Pacifist Difficulty removes enemy mobs from the game, /clear can remove items from players), Information Analysis (Various commands allows the player to analyze the world and other players), Weather Manipulation (/weather allows to change the weather of the world), Forcefield Creation (/worldborder allows to change the world border), Teleportation and BFR (Type 1, /tp teleports entities away), Time Manipulation and Circadian Manipulation (/time can change the time of the world), Summoning (/summon summons an entity), Sound Manipulation (/stopsound and /playsound nullifies or plays specific sounds), Limited Transmutation (/setblock and /replaceitem can change blocks into others and replace items on inventories), Status Effect Inducement and Purification (/effect can grant or remove any status effect, which include Nausea Inducement, Social Influencing Blindness Inducement, Probability Manipulation, Hunger Inducement or Health Boost, etc.), Limited Knowledge Manipulation (/recipe can remove or grant recipes from players), Death Manipulation (Type 1. /kill kills entities), Law Manipulation (/gamerule can set laws for the game), Creation (/give gives an item to a player), Possible Acausality (Type 4, /immutableworld can make the world immutable to any changes), Limited Detection (/detect allows the player to know if there's blocks in a specific direction), Duplication (/clone copies an existing block)

Weaknesses: None notable

Discussions (Link For Mobile Users):

Discussion threads involving Command Block