* 檔操作
* 查看目錄檔
* $ hadoop dfs -ls /user/cl
*
* 創建檔目錄
* $ hadoop dfs -mkdir /user/cl/temp
*
* HTTP://www.aliyun.com/zixun/aggregation/18137.html">刪除檔
* $ hadoop dfs -rm /user/cl/temp/a.txt
*
* 刪除目錄與目錄下所有檔
* $ hadoop dfs -rmr /user/cl/temp
*
* 上傳檔
* 上傳一個本機/home/cl/local.txt到hdfs中/user/cl/temp目錄下
* $ hadoop dfs -put /home/cl/local.txt /user/cl/temp
*
* 下載檔案
* 下載hdfs中/user/cl/temp目錄下的hdfs.txt檔到本機/home/cl/中
* $ hadoop dfs -get /user/cl/temp/hdfs.txt /home/cl
*
* 查看檔
* $ hadoop dfs –cat /home/cl/hdfs.txt
*
* Job操作
* 提交MapReduce Job, Hadoop所有的MapReduce Job都是一個jar包
* $ hadoop jar <local-jar-file> <java-class> <hdfs-input-file> <hdfs-output-dir>
* $ hadoop jar sandbox-mapred-0.0.20.jar sandbox.mapred.WordCountJob /user/cl/input.dat /user/cl/outputdir
*
* 殺死某個正在運行的Job
* 假設Job_Id為：job_201207121738_0001
* $ hadoop job -kill job_201207121738_0001
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