hadoop的stream

如统计一个文件有多少行(/user/hive/warehouse/platform.db/test/1)
结果保存到/user/jk/tmp2

hadoop  jar /opt/cloudera/parcels/CDH-4.2.1-1.cdh4.2.1.p0.5/lib/hadoop-mapreduce/hadoop-streaming.jar \
    -input /user/hive/warehouse/platform.db/test/1 \
    -output /user/jk/tmp2 \
    -mapper cat \
   -reducer  wc