I'm trying to run a block command like
/fill ~ ~ ~ ~15 ~15 ~15 minecraft:gravel 1 replace minecraft:air
and it's not filling anything. Do they accept tildes?
Edit: tileData and replaceDataValue only exist in Bedrock, so that's why it wasn't working.
1
does nothing except producing a syntax error. The output of the command block should also tell you that. – Fabian Röling Feb 4 at 6:51