Commands/testfor

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

Arguments

 * Specifies the targets to count. Must be a player name or a target selector.
 * Permits entities other than players.

Result
Fails if the arguments are not specified correctly, or if  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, which can be measured by a redstone comparator facing away from the command block.

Examples

 * To test if Alice is online:
 * To count the number of players in survival mode within a 3-block radius of (0,64,0):
 * To count the number of zombies within a 20-block radius of (0,64,0):

History
Befehl/testfor