Java Edition:Command Computer Commands
The Command Computer is a feature from Minecraft: Edu Edition that is obtainable in Survival by downgrading, once obtained the Command Computer can be used to execute commands without the world having cheats turned on. This is an extremely powerful method which can be used to obtain many other discontinued features.
Obtaining
From MinecraftEdu 1.7.10 Build 20 (a fork of 1.7.10) to MinecraftEdu 1.7.10 Build 22 (a fork of 1.7.10), the command computer had a numeric ID of 168, it was first introduced in MinecraftEdu 1.7.10 Build 20 (a fork of 1.7.10) when ComputerCraft was bundled into Minecraft: Edu Edition.[1] The numeric ID of 168 ended in MinecraftEdu 1.7.10 Build 22 (a fork of 1.7.10) because in MinecraftEdu 1.8.9 Build 1 (a fork of 1.8.9) it gained an alphanumeric ID and its numeric ID became 4099.
The command computer was never intended to be obtained in Survival and has no crafting recipe, but it shared a numeric ID of 168 with Prismarine. If prismarine is downgraded from between 14w25a (1.8 Snapshot) and 17w46a (1.13 Snapshot), to between MinecraftEdu 1.7.10 Build 20 (a fork of 1.7.10) and MinecraftEdu 1.7.10 Build 22 (a fork of 1.7.10) will convert prismarine into a no direction command computer. This conversion only occurs with the block and will convert back into prismarine when updated, no direction command computers have the same texture on all 4 sides.
Using
Attempting to directly right-click the command computer will give the error message "Must be an opped player in Creative mode." in the chat, due to this restriction an alternative method must be used to execute commands with the command computer. To use a command computer, a computer can be placed adjacent to the command computer, then a program can be created and edited by writing "edit [program name]" into the computers terminal. The programs name can have any characters except for spaces. The following code can be put into a program to boot a command computer from the left: peripheral.call("left", "reboot")
In that example, the command computer will run if it is on the left side of the computer, the other available sides are right, front, back, top, and bottom. To execute that program, the player must press left control/command and then enter while selecting [Save], then left control/command and then enter while selecting [Exit] (navigate using the right/left arrow keys). Now, putting the programs name into the terminal will execute its code, after this all that is required is that the programs name is entered into the terminal as long as the computer isn't broken.
While no command can be put into the command computer since its inaccessible, commands can be added to the start up sequence of all computers through a resource pack and Citty's Command Computer Resource Pack can be used as a template. Within the zip of Citty's resource pack, the command can be found in this file path within the zip: \assets\computercraft\lua\rom\autorun\autoruna, if the autoruna file is opened with a text editor, such as Notepad++ then the contents will be: commands.exec("say Somebody once told me the world is gonna roll me, I ain't the sharpest tool in the shed.")
With the default text, the command being executed is /say, but the text within the quotation marks can be changed to any command the player desires to execute. Make sure file is saved after being edited, and is placed back into the same file location with the same file name and extension (remove the .txt from Notepad++). Finally, place the resource pack zip into the .minecraft\resourcepacks folder, and select it in-game.
Uses
This feature can be used to execute any desired commands that exist in this version range, and nearly every other discontinued feature on this wiki can be obtained using this method. This feature can be used to use the setblock command to place command blocks with pre-set commands that could be powered and executed in later versions, and future items could be obtained by giving chests with a BlockEntityTag.Items tag. Changing the players gamemode will require that player to relog for the hotbar to visually update.
Command Generators for 1.7: