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I have a way to execute at a block, but it is just not working. I am trying to make an ore scanner that activates when you hold an item named "Scanner" in your hand. I have the "activate when holding item" part done. Italics are optional or changeable commands. COMMANDS: Not working part: execute @p ~ ~ ~ /fill ~5 ~5 ~5 ~-5 ~-5 ~-5 minecraft:command_block 0 replace minecraft:iron_ore 0 {auto:1b,Command:"/summon shulker ~ ~ ~ {CustomName:\"Scanned\",NoGravity:1b,AttachFace:0,Color:15b,Invulnerable:1,PersistenceRequired:1,NoAI:1,Silent:1,Glowing:1b}}

execute @e[name=Scanned,type=shulker] ~ ~ ~ setblock iron_ore ~ ~ ~ kill @e[name=Scanned,type=shulker]

Use to execute command execute @e[name=Scanned,type=shulker] ~ ~ ~ COMMAND HERE

  • How does this not work? Do you get an error or something? – Frank May 18 '17 at 23:21
  • I get an error that says "could not execute command as player" – HERECOMESTHEMONEY May 19 '17 at 18:45
  • your Command:" " tag is never closed, meaning it's missing its second quotation mark. }"} – Plagiatus May 20 '17 at 9:03
  • @Plagiatus I just tried that, but it did not work. – HERECOMESTHEMONEY May 20 '17 at 14:31
  • okay now I know the problem. – Plagiatus May 20 '17 at 17:31
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First of all:
you're missing a " to close the Command:"" tag.


The next problem is this:

The syntax (wiki for reference) for the fill/replace is

fill <x1> <y1> <z1> <x2> <y2> <z2> <block> <dataValue|state> replace [replaceTileName] [replaceDataValue]

There is no [dataTag] for the block to fill in there, it's not supported with the replace argument.

The non-replace syntax is this:

fill <x1> <y1> <z1> <x2> <y2> <z2> <block> [dataValue|state] [oldBlockHandling] [dataTag]

that means you have to work around that if you want to use fill/replace with a dataTag, for example like this:

  • filling the areas air blocks with something you never need, like structure_voids,
  • then replace the iron_ore blocks with air and
  • then set the commandblock with fill/keep to replace all the air blocks.
  • last, remove the placeholder blocks
  • That was laggy. But still did not work. The only way I see it could not work is executing, because the command is too long. – HERECOMESTHEMONEY May 20 '17 at 23:57
  • too long? commandblocks have a limit of 35.000 characters, i doubt this command will get too long anytime soon. – Plagiatus May 21 '17 at 0:46
  • No, like the player executing a very long command due to the execute command. – HERECOMESTHEMONEY May 21 '17 at 13:08
  • it doesn't work like that. the moment it's run from a commandblock, even with execute on a player, the commandblock-rules apply and not the chat rules. make sure you actually run this in a commandblock. also, if that were the case, you'd get errors in the output. do you get any errors in the output? – Plagiatus May 22 '17 at 7:39
  • I just had the replace iron ore with air command backwards. It works perfectly now that I flipped it back around. – HERECOMESTHEMONEY May 22 '17 at 19:14

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