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hadoop jar $HADOOP_INSTALL/contrib/streaming/hadoop-*-streaming.jar \
  -input input/ncdc/all \
  -output output \
  -mapper "ch02/ruby/max_temperature_map.rb | sort | ch02/ruby/max_temperature_reduce.rb" \
  -reducer src/main/ch02/ruby/max_temperature_reduce.rb \
  -file src/main/ch02/ruby/max_temperature_map.rb \
  -file src/main/ch02/ruby/max_temperature_reduce.rb
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