Minecraft – How to use a command block to add coordinates to another command block

Here is the clone command syntax:

/clone [x1] [y1] [z1] [x2] [y2] [z2] [xdest] [ydest] [zdest] normal move

[x1] [y1] [z1] are the coordinates for the first corner of your plane. The clone command works in a rectangular area, so the first corner should be opposite to to second corner.

[x2] [y2] [z2] are just the second corners.

[xdest] [ydest] [zdest] are where the game will clone the area to. (Well, it will move it because in the command we are telling it to) This always clones based on the selected area's lowest X,Y, and Z. So make sure you do that right.

~'s can replace any coordinate, and they simply stand for the executor's (command block's) position. So ~-1 would be 1 block behind the command block.

I hope this helps!

What you could do to make your testing as real as possible is target entities with the @e selector in replacement of real players, and try testing your command blocks with entities like villagers.

For an example if you were trying to tp a player with /tp @p (Coordinates) You could replace @p or @a with @e to teleport entities.

@e should be effective for most contraptions involving players.

Note: This is how I test my contraptions unless I'm with a friend.