Im trying to make a wave spawn kind of thing and i would like a command block to activate its comparator redstone signal when the command blocks command is negative.
I tried this using /testfor @e[type=!Zombie] but that does not work as it detects the player or any other mob. any way to do this without a redstone torch ?
One way to do this is to have a second command block testing if the previous one failed:
The impulse command block would have your current command (/testfor @e[type=Zombie]).
The chain command block, which is the one you should run comparators/conditionals off of, would then have:
/testforblock X Y Z command_block -1 {SuccessCount:0}
X Y Z should be the coordinates of the impulse command block.
This makes the chain block succeed when the impulse block fails.
testforblock failed, ie: the command block the testforblock is targeting succeeded. The error does not indicate that anything is wrong with the system. Your coordinates should be pointing to the impulse block though, not to the chain block (~ ~ ~) that's running the testforblock.
