1.列出根目錄下所有的目錄或文件
hadoop dfs -ls /
2.列出/user目錄下的所有目錄和文件
Hadoop dfs -ls /user
3.列出/user目錄及其子目錄下的所有文件（謹慎使用）
hadoop dfs -ls -R /user
4.創建/soft目錄
hadoop dfs -mkdir /soft
5.創建多級目錄
hadoop dfs -mkdir -p /apps/windows/2017/01/01
6.將本地的wordcount.jar文件上傳到/wordcount目錄下
hadoop dfs -put wordcount.jar /wordcount
7.下載words.txt文件到本地
hadoop dfs -get /words.txt
8.將/stu/students.txt文件拷貝到本地
hadoop dfs -copyToLocal /stu/students.txt
9.將word.txt文件拷貝到/wordcount/input/目錄
hadoop dfs -copyFromLocal word.txt /wordcount/input
10.將word.txt文件從本地移動到/wordcount/input/目錄下
hadoop dfs -moveFromLocal word.txt /wordcount/input/
11.將/stu/students.txt拷貝一份為/stu/students.txt.bak
hadoop dfs -cp /stu/students.txt /stu/students.txt.bak
12.將/flume/tailout/目錄下的子目錄或文件都拷貝到/logs目錄（如果此目錄不存在會創建）下
hadoop dfs -cp /flume/tailout/ /logs
13.將/word.txt文件重命名為/words.txt
hadoop dfs -mv /word.txt /words.txt
14.將/words.txt文件移動到/wordcount/input/目錄下
hadoop dfs -mv /words.txt /wordcount/input/
15.將/ws目錄以及子目錄和文件都刪除（謹慎使用）
hadoop dfs -rm -r /ws
16.刪除以"xbs-"開頭的目錄及其子目錄
hadoop dfs -rm -r /xbs-*
17.將/wordcount/output2/目錄下的a.txt文件刪除
hadoop dfs -rm /wordcount/output2/a.txt
18.將/wordcount/input/目錄下面的所有文件都刪除
hadoop dfs -rm /wordcount/input/*
19.查看HDFS集群的磁盤空間使用情況
hadoop dfs -df -h
20.查看/word.txt文件的內容
hadoop dfs -cat /word.txt
21.將name.txt文件中的內容添加到/wordcount/input/words.txt文件中
hadoop dfs -appendToFile name.txt /wordcount/input/words.txt
22.動態查看/wordcount/input/words.txt文件的內容
hadoop dfs -tail -f /wordcount/input/words.txt
23.統計/flume目錄總大小
hadoop dfs -du -s -h /flume
24.分別統計/flume目錄下各個子目錄（或文件）大小
hadoop dfs -du -s -h /flume/*
25.運行jar包中的程序
//hadoop jar + 要執行的jar包 + 要運行的類 + 輸入目錄 + 輸出目錄
hadoop jar wordcount.jar com.xuebusi.hadoop.mr.WordCountDriver /wordcount/input /wordcount/out
26.查看hdfs集群狀態
hdfs dfsadmin -report
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27.查看hadoop fs命令使用幫助
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