Minecraft delete all placed command blocks in the world?

I have placed a command block in the world that i can't find anymore but i would like to remove the block only i don't know the command

It would be great if someone gave the order

You can replace all command blocks with air in one area, but not in the whole world:

/ fill ~ -100 0 ~ -100 ~ 100 256 ~ 100 air replace command_block

Nothing happens

Then you have to execute the command in another area.