Minecraft Forums

I see what you were trying to do and as much as I wish that worked, that's not how selectors work.
Selectors are much more limited than data tags and can only check for a few things:

So, you can not check for what a player has in their inventory using selectors. We can check what players have in their inventory by using a command that has a data tag in its syntax, an example would be the /testfor command which syntax looks like this:
/testfor <player> [dataTag]
That's why you were able to check the players inventory using the testfor command.

We can not use /testfor to solve your problem but we can use /scoreboard tags, which syntax looks like this:
/scoreboard players tag <player> <add:remove:list> <tagName> [dataTag]


I made a simple demo using scoreboard tags
https://streamable.com/92k48

Here's the world download:
https://cdn.discordapp.com/attachments/384031761929338892/384277119640797184/Potion_Effect_Demo.7z

List of known bugs:

* Score tag does not work in 1.9.3+ (Mojang, plx fix) (is this still a problem? Could someone try the score tag?)

Change log:

Quote from CarbCreation»

I got some weird glitch, that inside a Minecart command block, that stuff doesnt work... :/ here is the command I use:

summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:/blockdata ~ ~2 ~ {Text1:"[{\"text\":\"==============\",\"bold\":true}]"}}]}]}]}

The command is executable, but the sign doesn't change at the specific spot. :/ what should I do?

Hah, this is an interesting glitch. The glitch was caused by you trying to execute my command inside of the data tag section of another command.
If you plan on doing that alot, let me know and I could add an option to fix it.
If you only need that specific command, here is the fixed version:

summon FallingSand ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:FallingSand,Block:redstone_block,Time:1,Passengers:[{id:FallingSand,Block:activator_rail,Time:1,Passengers:[{id:MinecartCommandBlock,Command:/blockdata ~ ~2 ~ {Text1:"[{\\\"text\\\":\\\"==============\\\",\\\"bold\\\":true}]"}}]}]}]}

Version 2.0 is out!

http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-tools/2567931-1-9-autumns-sign-generator

Old version (not recommended):

Click the plus and a window should pop up

Quote from Mafrans»

I leave autumn to do this as I have no idea of even what the /stat command is (I need to do more research Dx)

Im out *packs bag of redstone and command blocks*

I do not blame you. I don't think many know about the commandstats tag and the /stats command.
If you really want to know how they work and what you can do with them you can check out dragnoz videos about them:

As for the actually topic of this thread. Here's my prototype:

First you need a scoreboard objective:

/scoreboard objectives add blocks dummy

Place down a command block with this command in it:

/fill -297 4 34 -299 4 32 minecraft:wool 0 replace minecraft:wool 15

That command will replace all black wool with white wool.

Now you need to use this command once:

/blockdata ~ ~-1 ~ {CommandStats:{AffectedBlocksName:"Wool",AffectedBlocksObjective:"blocks"}}

You want to replace x y z with the cords for the command block with the fill command inside it.

That command will add the tag CommandStats to the command block.

Now every time the /fill command block executes it will dumb its result in to the scoreboard objective blocks as Wool

Greetings

This command should do it:

/testforblock x y z minecraft:command_block -1 {Command:"/say hello"}

I have no idea what you are talking about but I am pretty sure this should not be posted in the redstone section.

Greetings

Setblock or fill can't place blocks in unloaded chunks.

Mojang has however hinted that that i might be possible in future versions of minecraft.