hadoop jar $HADOOP_HOME/share/hadoop/tools/lib/hadoop-streaming-*.jar \
  -input input/ncdc/sample.txt \
  -output output \
  -inputformat org.apache.hadoop.mapred.TextInputFormat \
  -mapper /bin/cat \
  -partitioner org.apache.hadoop.mapred.lib.HashPartitioner \
  -numReduceTasks 1 \
  -reducer org.apache.hadoop.mapred.lib.IdentityReducer \
  -outputformat org.apache.hadoop.mapred.TextOutputFormat