hdfs dfs -ls /data/rosense-grid/ query
hdfs dfs -get /data/rosense-grid/cellcache.csv download
hdfs dfs -rm -r -skipTrash /data/rosense-grid/cellcache.csv delete
hdfs dfs -ls /data/rosense-grid/ query
hdfs dfs -put /home/luoshen/cellcache.csv /data/rosense-grid upload