How to use /testfor to sense mobs?

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For a map I'm making, there are skeletons that you have to shoot, kind of like a carnival game. But I want one to spawn only when there are none there, so they all don't pile up. Is there a way I can use /testfor
to do this?
Best Answer
USE PRESSURE PLATES!
You're really overthinking the problem.
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How do you Testfor entities in Minecraft?
2. Type the CommandCan you locate mobs in Minecraft?
Rather than spawning them in (and not being able to see where they naturally spawn, their habitats, etc.), it would be cool to have a /locatemob and/or /moblocate command that works as follows: /moblocate <mob/entity>, and the result would simply be the same as the /locate - /locatebiome commands, simply giving you the ...Minecraft Command Tutorial: Learning How to Use /testfor in Minecraft | 1.12.2 | pre-1.13
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