Command Block

Obtaining

Command blocks can be obtained by using the pick block control Minecraft uses the standard control scheme of mouse and keyboard controls as input. The game cannot be played using only a mouse or only a keyboard using the default control scheme. The controls menu is or with various commands, such as /give @p minecraft:command_block.

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

Command blocks are not available in the Creative Pixel art and other creations made in Creative mode. "Sandbox" redirects here. For a place to test edits to this wiki, see Minecraft Wiki:Sandbox. Creative mode is one of the main game modes in Minecraft. inventory, cannot be broken in Survival mode A new Survival game of Minecraft. The health and hunger bars, as well as the hotbar, are visible. See the game mode. For other uses, see Survival (disambiguation). Survival mode is one or if you do not have operator permissions, are not flammable, and have the same blast resistance A TNT explosion. An explosion is a physical event, generally destructive, that can be caused by several different circumstances. It can destroy nearby blocks, propel and damage nearby players, entities, and their armor, and cause as bedrock Bedrock Transparency No Luminance No Blast resistance 18,000,000 Tool None Renewable No Stackable Yes (64) Flammable No Drops None Data value dec: 07 hex: 7 bin: 111 Name bedrock Bedrock is a block, indestructible by survival means. Contents . Command blocks cannot be moved by a piston Piston Transparency Yes Luminance None Blast resistance 2.5 Tool Any tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data values See Data values Pistons are blocks capable of pushing most blocks, depending on .

Info

Command Block

Type	Block Entity
Physics	No
Transparency When leaves are opaque (in "fast" graphics), they completely block rendering. When leaves are transparent (in "fancy" graphics), the world behind them is also rendered. Opacity (and its inverse, transparency) are properties of blocks with	No
Luminance Light (or lighting) in Minecraft affects visibility, mob spawning, and plant growth. Contents 1 Brightness 1.1 Spread 2 Sources of light 2.1 Blocks 2.2 Other 3 Light-filtering blocks 4 Effects of light 4.1 Mobs 4.2	No
Blast resistance	18,000,000
Hardness	-1
Tool	None
Renewable A renewable resource (as opposed to a non-renewable, or finite, resource) is a resource that can be recreated indefinitely in survival without exploiting glitches or using commands. While running out of resources isn t likely to	No
Stackable	Yes (64)
Flammable	No
First appearances	See history
Drops See the items that drop from entities and blocks. For drops as in falls, see Fall Damage. Typical drops from a skeleton: experience orbs, an arrow, and bones. Drops are items that	None
Block entity id	command_block
Data values See values from the latest PCPersonal Computer version of Minecraft. For values from Classic, see Data values/Classic. For values from Indev, see Data values/Indev. For values from the Pocket Edition, see Pocket Edition	See Data values
Name See the definition of the block states. For the files that determine block models, see Models#Block states. Block states are extra pieces of data that further define a block. Contents 1 List	See Data values

	“	So this block will be able to run cmds on redstone signals. With proper commands, many things can be scripted	„
		— Jeb Jens Bergensten Real name Jens Bergensten Date of birth May 18, 1979 (age 38) 1] 2] Occupation Lead creative designer Nationality Swedish Languages English, Swedish 3] Spouse Jenny Bergensten 4] Children 1 5] Website oxeyegames.com Known announcing the command block

A command block is a block See the various blocks found in Minecraft. For the blocking with shields that reduces damage when performed, see Blocking. All blocks Blocks are the basic units of structure in Minecraft. Contents 1 that can execute commands. Because it cannot be obtained in Survival mode A new Survival game of Minecraft. The health and hunger bars, as well as the hotbar, are visible. See the game mode. For other uses, see Survival (disambiguation). Survival mode is one without cheats, it is primarily used on multiplayer servers and in custom maps.

Videos

Usage

See also: Commands Contents 1 Usage 1.1 Tilde notation 1.2 Target selectors 1.2.1 Target selector variables 1.2.2 Target selector arguments 1.3 Data tags 1.4 Raw JSON text 1.5 Block/item names 2 Summary of commands 3 List of commands and Tutorials/Command Block This article may need cleanup to comply with the style guide. Please help improve this if you can. The talk page may contain suggestions. This article is a stub. Please help us by expanding it.

A command block can execute commands when activated by redstone power See redstone circuits. For other redstone-related articles, see Redstone (disambiguation). Contents 1 Redstone basics 1.1 Redstone components 1.2 Power 1.3 Power level 1.4 Redstone update 1.5 Redstone tick 1.6 Signals and pulses . It always has all permissions, so it can be used to allow a specific use of a command by players who can`t use that command in general (for instance, allowing anyone to obtain a specific item with /give, without allowing everyone to /give themselves whatever they want).

A command block has an orientation ("facing") which determines which chain command block will be activated, and which blocks will be checked to see if a command block in "Conditional" mode executes.

Modification

Command block GUI.

To enter or modify the command in a command block, use the Use Item control Minecraft uses the standard control scheme of mouse and keyboard controls as input. The game cannot be played using only a mouse or only a keyboard using the default control scheme. The controls menu is on the command block to open the command block GUI (graphical user interface). The GUI will only open if the player is in Creative mode Pixel art and other creations made in Creative mode. "Sandbox" redirects here. For a place to test edits to this wiki, see Minecraft Wiki:Sandbox. Creative mode is one of the main game modes in Minecraft. , and has the proper permissions. In singleplayer See general gameplay in Minecraft. For instructional material, see Tutorials. A fresh Survival game. Gameplay in most game modes of Minecraft consists mainly of adding and destroying a variety of different blocks , cheats must be enabled to edit command blocks. In multiplayer See the multiplayer experience in Minecraft. For the multiplayer software, see Server. PvP (Player versus Player) on a multiplayer server. Multiplayer is the server-based version of Minecraft that enables multiple players to , command blocks can only be edited successfully by operators See the multiplayer software in Minecraft. For the multiplayer experience, see Multiplayer. For the official Mojang paid-for servers, see Realms. For other unofficial Minecraft server software, see custom servers. Minecraft servers allow in Creative mode, and for command blocks to work at all the following values must be set in the server.properties The default server.properties file. server.properties is the file which stores all the settings for a multiplayer (Minecraft or Minecraft Classic) server. If you are going to edit server.properties it is important that you use the file:

• enable-command-block must be set to true
• op-permission-level must be set to 2 or above (default is 4)

Console Command

Commands can be entered in the top text pane. The text limit for commands in a command block is 32,500 characters, but the text pane can only show a small portion of this amount at a time. Press Tab ⃢₆Ⅱ to complete words or cycle through options.

Commands in a command block do not need to be prefixed with the forward slash (/) as they do in the chat window, but doing so will still work.

Below the console command text pane are some reminder tips about how to use target selectors.

Previous Output

The bottom text pane displays the output message (success or failure) of the last executed command (initially blank). Its text is not editable.

A button to the right of the Previous Output text pane specifies whether the last output should be stored and displayed. It shows O (the default) when the output should be stored and X when the output should not be stored. A command block that`s tracking its output while executing its command will cause a block update, and when you have 64 of those command blocks tracking their output while executing their command sharing the same chunk, it will then cause 1 or more chunk updates because 64 block updates in 1 chunk will cause one or more chunk updates. If the amount of chunk updates is high enough, then it can cause fps drops for players if they receiving the chunk updates. To avoid this, simply have all of your command blocks not track their output at all. The track output option should only be used temporarily for debugging purposes.

Impulse/Chain/Repeat

Click the "Impulse/Chain/Repeat" button to change the command block`s type. The default state is "Impulse", but non-default command blocks can be placed. The command block also changes color when changing its command block type:

• "Impulse" command blocks are orange. These execute once every time they are activated.
• "Chain" command blocks are green. These execute only after the command block pointing to it is processed. This differs from the Conditional option in that it detects what is pointing to it, instead of simply behind it. The command blocks pointing to it also don`t need to be chain command blocks themselves to trigger the chain.
• "Repeat" command blocks are purple. These will execute their commands once per game tick as long as they are activated (20 times per second, barring lag).

Conditional/Unconditional

Top: Command blocks in "Unconditional" mode. Bottom: Command blocks in "Conditional" mode.

Click the "Conditional/Unconditional" button to change the command block`s conditional behavior:

• "Conditional": A command block in conditional mode will only execute its command after the command block behind it has executed successfully ("behind it" in the sense of opposite to the direction the command block is facing, regardless of chain direction or even if chaining is occurring).
• "Unconditional" (default): A command block in unconditional mode will execute its command (if activated correctly) even if there`s a command block behind it that didn`t execute its command successfully.

Always Active/Needs Redstone

Click the "Always Active/Needs Redstone" button to change the command block`s activation requirements:

• "Needs Redstone" (the default for impulse and repeat command blocks): A command block in the "Needs Redstone" setting must be activated with redstone in order to execute its command.
• "Always Active" (the default for chain command blocks): The command block is always active even without redstone activation (chain command blocks will execute their command when chained, repeating command blocks will execute their command every game tick (20 times every second), and impulse command blocks activate once then cannot be activated again).

Done

Click the "Done" button or ⃢₆ℾ Enter to save the command and leave the command block GUI.

Cancel

Click the "Cancel" button or Esc to leave the command block GUI without saving any changes.

Activation

Command blocks are redstone mechanisms and can be activated by:

• An adjacent active power component: for instance, a redstone torch Redstone Torch Transparency Yes Luminance Yes, 7 (when on) Blast resistance 0 Tool Any tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data values See Data values Name See Data values This article (except that a redstone torch will not activate a command block it is attached to), a block of redstone Block of Redstone Transparency Partial (blocks light, mob spawning possible) Luminance No Blast resistance 30 Tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data value dec: 152 hex: 98 bin: 10011000 Name redstone_block This article is , a daylight sensor Daylight Sensor Type Block Entity Physics No Transparency Yes Luminance No Blast resistance 1 Hardness 0.2 Tool Renewable No Stackable Yes (64) Flammable No, but catches fire from lava First appearances See History Drops Itself , a button Button Transparency Yes Luminance No Blast resistance 2.5 Tool Any tool Renewable Yes Stackable Yes (64) Flammable No Drops Itself Data values See Data values Name See Data values A button is a non-solid block etc.
• An adjacent powered block (for instance, an opaque block with an active redstone torch under it)
• A powered redstone comparator Redstone Comparator Transparency Yes Luminance No (7 when powered, in Pocket Edition) Blast resistance 0 Tool Any tool Renewable No Stackable Yes (64) Flammable No Drops Redstone Comparator (1) Data values See Data values Name or redstone repeater Redstone Repeater Transparency Yes (partial) Luminance No (7 when powered, in Pocket Edition) Blast resistance 0 Tool Any tool Renewable Yes Stackable Yes (64) Flammable No Availability Survival, Creative Drops Redstone Repeater (1) Data values facing the mechanism component
• Powered redstone dust Redstone Transparency Yes Luminance No Blast resistance 0 Tool Any tool Renewable Yes Stackable Yes (64) Flammable No Availability Survival Drops Redstone (1) Data values See Data values Name See Data values This article is configured to point at the command block (or on top of it) or directionless; a command block is not activated by adjacent powered redstone dust which is configured to point away from it.

In addition, when a command block is cloned by a command to a powered location, the new command block will only execute its command if the original has never been activated (visible in the F3 debug screen as "triggered").

Unlike all other redstone components except the note block Note Block Type Solid Block Requirements None Physics No Transparency No Luminance No Blast resistance 4 Hardness 0.8 Tool Renewable Yes Stackable Yes (64) Flammable No, but catches fire from lava First appearances See History , a command block can be activated every game tick Nearly all video games (including Minecraft) are driven by one big program loop. Just as every gear in a clock is synchronized with the pendulum, every task involved in advancing a game simulation is synchronized (20 times per second, barring lag). Be that as it may, activating it two game ticks in a row requires that it transition from powered to unpowered and back during the same tick (for instance, with a setblock clock).

A command block in "Always Active" mode is always activated. The default state is "Needs Redstone", which means that it runs only when powered.

When activated, a command block will try to execute its command. depending on the command block`s type:

• a command block ("Impulse") will try to execute its command once
• a chain command block ("Chain") will not try to execute its command until another command block facing it executes its own command
• a repeating command block ("Repeat") will try to execute its command every game tick until no longer activated

Chained execution

If any command block faces a chain command block (a command block in "Chain" mode) when activated, it will notify the chain command block to also attempt execution. The chain command block will only execute its command if activated and, if in "Conditional" mode, if the command block behind it executed successfully (behind in the sense of the direction it is facing, not in the sense of which command block chained to it). Whether or not the chain command block is activated or executes successfully, if it is facing another chain command block, it will notify it to attempt execution as well.

Chained command blocks execute in the same game tick in the order they are chained. Chained execution cannot be passed to a command block which has already executed in that game tick (loops execute only once).

Output

When activated, a command block can produce multiple types of output:

Redstone Comparator

A command block can power a redstone comparator facing away from it (possibly separated by a block) with a signal strength specific to the last executed command (for instance, the number of players affected by the command).

The signal strength always reflects the last command executed, even after the command block is deactivated.

Message

The output message describes the success or failure of the executed command, and may be written to multiple destinations:

Previous Output: The output message is always written to the "Previous Output" text pane of the command block GUI.

Chat: The output message is written to the chat text in singleplayer mode, or broadcast to all other ops in multiplayer mode, unless it has been suppressed with /gamerule commandBlockOutput false. Some commands may write additional text to the chat as their normal function which won`t be suppressed (for instance, the /say command will write a message to the chat of all players), separate from the output message. Chat messages which would usually be prefaced by a player`s name (such as from the /me, /say and /tell commands) use @ as the player name. If the command block had been named in an anvil Anvil Transparency Yes Luminance No Blast resistance 6,000 Tool Renewable Yes Stackable Yes (64), same damage state only Flammable No Drops Itself Data value dec: 145 hex: 91 bin: 10010001 Name anvil See the item before placement, that name will be used instead.

Logs: The output message is written to multiplayer server logs unless it has been suppressed with /gamerule logAdminCommands false.

Command Stats

Command blocks can post various success results to scoreboard objectives, including:

• SuccessCount: the number of successes (previously also available by redstone comparator output, but not limited to 15)
• AffectedBlocks: the number of blocks that were altered
• AffectedEntities: the number of entities that were altered (including players)
• AffectedItems: the number of items that were altered
• QueryResult: value returned by command

The objectives to be used can be specified by running the /stats command or by modifying the command block`s NBT data directly with the /blockdata command.

Notes

The following commands cannot be used in a command block: /ban, /banlist, /ban-ip, /debug, /deop, /kick, /op, /pardon, /pardon-ip, /publish, /save-all, /save-off, /save-on, /stop, and /whitelist (i.e., /debug, /publish, and all of the multiplayer-only commands except /list).

The following commands are usable but with limited functionality (their output only displays in the command block`s Previous Output pane rather than being displayed in the chat): /help, /seed, /list, /scoreboard objectives, /scoreboard players, and /scoreboard teams list.

The following commands use the command block`s name (defaults to @) in their output: /me, /say, and /tell.

Easter eggs

Running "Searge" as the command in the command block without a preceding "/" will now set the previous output to "#itzlipofutzli". Additionally, if /help is run via command block, it gives various messages prefixed with "Searge says: ".

Data values

A command block has an ID name of minecraft:command_block and is further defined by its block data and block entity. A command block also has a block state which is expected to replace the functionality of block data in 1.13 1.13 Planned releaseAnnounce date ? ◄◄ 1.12 See the computer edition. For other editions, see Version history (disambiguation). 1.13 is an upcoming major update with no set release date. It will focus . ^{upcoming This page is about planned versions of all editions of Minecraft. These updates either have major sources to their existence or have received development versions. Note that only editions with known planned updates are listed}

ID

A command block`s ID determines its mode:

Name See the definition of the block states. For the files that determine block models, see Models#Block states. Block states are extra pieces of data that further define a block. Contents 1 List	ID Name	Block/Item ID
Command Block	minecraft:command_block	137
Repeating Command Block	minecraft:repeating_command_block	210
Chain Command Block	minecraft:chain_command_block	211

Block data

See also: Data values See values from the latest PC version of Minecraft. For values from Classic, see Data values/Classic. For values from Indev, see Data values/Indev. For values from the Pocket Edition, see Pocket Edition

A command block`s block data specifies whether the command block is currently activated.

Block entity

See also: Block entity format Chunks store the terrain and entities within a 16×256×16 area. They also store precomputed lighting, heightmap data for Minecraft s performance, and other meta information. Contents 1 NBT structure 2 Block format 3 Entity format 3.1

A command block has a block entity associated with it that holds additional data about the block. The block`s block entity ID is command_block.

Block state

See also: Block states

Name See the definition of the block states. For the files that determine block models, see Models#Block states. Block states are extra pieces of data that further define a block. Contents 1 List	Value	Description
⃂conditional	true false	True if the command block is in conditional mode.
⃂facing	north south east west up down	The direction the command block is pointing.

Video

History

See also: Commands⃂₧⃂History

Official release Minecraft 1.0 Starting version 1.0.0 (Nov. 18th, 2011) Latest version 1.12 Paid Yes Website http://www.minecraft.net/ See the official release of Minecraft for the PC. For the version, see 1.0.0. For the first
27 Jul. 2012					Jeb Jens Bergensten Real name Jens Bergensten Date of birth May 18, 1979 (age 38) 1] 2] Occupation Lead creative designer Nationality Swedish Languages English, Swedish 3] Spouse Jenny Bergensten 4] Children 1 5] Website oxeyegames.com Known began tweeting of a new block he had created to start expanding Adventure mode. He began posting pictures, ideas and hints of what the block will be able to do.
31 Jul. 2012					During Notch`s AMA he hinted the block may be in 1.4.
1.4.2			12w32a		Added command block.
1.5			13w03a		Command block success can now power a redstone comparator Redstone Comparator Transparency Yes Luminance No (7 when powered, in Pocket Edition) Blast resistance 0 Tool Any tool Renewable No Stackable Yes (64) Flammable No Drops Redstone Comparator (1) Data values See Data values Name .
			13w04a		Command blocks renamed with an anvil Anvil Transparency Yes Luminance No Blast resistance 6,000 Tool Renewable Yes Stackable Yes (64), same damage state only Flammable No Drops Itself Data value dec: 145 hex: 91 bin: 10010001 Name anvil See the item now use their name instead of @ in the chat.
1.6.1			13w19a		Command blocks are no longer mineable in Survival, and are also not damaged by explosions except by Blue Wither Skulls.
1.7.2			13w37a		Added a bar that shows the previous output.
					Increased the character limit from 256 to 16,369 when inserting a command in-game. Using a third-party editor allows you to reach 32,767 characters.
1.8			14w07a		Dispensers now place command blocks, instead of shooting it out.
			14w20a		Removed the in-game character limit of 16,369, allowing access to the full 32,767 characters.
			14w27a		Added CommandStats NBT tag.
1.8.6					Dispensers no longer place command blocks.
1.9			15w33a		Character limit is now 32,500 instead of 32,767
			15w34a		Added Chain Command Block and Repeating Command Block.
					Added block facing.
					Updated block textures.
			15w34b		Added Conditional mode.
					Added tab completion support.
			15w35a		Updated texture of all three command blocks
					Added Always active and needs redstone options. Added auto NBT tag to control this.
					When set to conditional, the back of the arrow texture is curved.
			15w36a		Players unable to use commands such as /give can no longer place command blocks.
			15w36d		Each command block type now appears with different colors on maps.
			16w02a		Running /help in a command block will now randomly use one of various different humorous phrases as the previous output.
			16w04a		Running "Searge" as the command in the command block without a preceding "/" will now set the previous output to "#itzlipofutzli".
1.11			16w32a		The block entity ID is changed from Control to command_block.
1.12			17w16a		Chains of command blocks no longer schedule their commands to be run in the next tick, they now execute all in the same tick they are read. This allows later blocks in a chain to be modified via earlier blocks, allowing techniques like branching and looping, all in the same tick.
					Added maxCommandChainLength game rule to control the max length of such a chain.
			17w17a		Added UpdateLastExecution and LastExecution NBT tags, which control the tracking of which tick a chain command block was last executed in.
			pre6		Tab-completing command names in command blocks will no longer add a / prefix.
Pocket Edition
1.0.5			build 1		Added all types of command blocks.

Gallery

• 

  The command block GUI in Pocket Edition

• 

  The first image released by Mojang of the command block.

• 

  The second image released by Mojang showing the block giving glass to the player.

Issues

Issues relating to ⃢₀ₜCommand Block⃢₀₝ are maintained on the issue tracker. Report issues there.