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First introduced

1.5 (13w03a)
PE 1.0.5 (PE 1.0.5 build 1)

Counts entities (players, mobs, items, etc.) matching specified conditions.

  • Java Edition
testfor <player> [dataTag]
  • Pocket Edition
testfor <victim: target>
player (PE: victim: target)
Specifies the targets to count. Must be a player name or a target selector (@e is permitted to target entities other than players).
dataTag (optional)[Java Edition only]
Specifies the data tags the entities must have to match successfully. Must be a compound NBT tag (for example, {XpLevel:3}).
Fails if the arguments are not specified correctly, or if player fails to resolve to one or more entities (named players must be online).
On success, produces a success count equal to the number of targets matching player, which can be measured by a redstone comparator facing away from the command block.
To test if Alice is online: testfor Alice
To count the number of players in survival mode within a 3-block radius of (0,64,0): testfor @a[x=0,y=64,z=0,r=3,m=0]
To count the number of zombies within a 20-block radius of (0,64,0): testfor @e[x=0,y=64,z=0,r=20,type=zombie]
To count the number of players currently flying: testfor @a {abilities:{flying:1b}}
To test if an arrow is in a block: testfor @e[type=arrow] {inGround:1b}