View kafka version information

# 进入kafka目录
cd %KAFKA_HOME%
# ls libs | grep kafka_
kafka_2.12-2.5.1.jar
kafka_2.12-2.5.1.jar.asc
kafka_2.12-2.5.1-scaladoc.jar
kafka_2.12-2.5.1-scaladoc.jar.asc
kafka_2.12-2.5.1-sources.jar
kafka_2.12-2.5.1-sources.jar.asc
kafka_2.12-2.5.1-test-sources.jar
kafka_2.12-2.5.1-test-sources.jar.asc

2.12 is the scala version and 2.5.1 is the kafka version