Can't open console producer

[单车]

type the command :
> bin/kafka-console-producer.sh --broker-list localhost:9092 --topic test
but, return nothing,like:
[root@master1 kafka_2.10-0.8.2.1]# bin/kafka-console-producer.sh --broker-list 
localhost:9092 --topic test
[root@master1 kafka_2.10-0.8.2.1]#
why?