1.列出根目录下所有的目录或文件
hadoop dfs -ls /
2.列出/user目录下的所有目录和文件
Hadoop dfs -ls /user
3.列出/user目录及其子目录下的所有文件（谨慎使用）
hadoop dfs -ls -R /user
4.创建/soft目录
hadoop dfs -mkdir /soft
5.创建多级目录
hadoop dfs -mkdir -p /apps/windows/2017/01/01
6.将本地的wordcount.jar文件上传到/wordcount目录下
hadoop dfs -put wordcount.jar /wordcount
7.下载words.txt文件到本地
hadoop dfs -get /words.txt
8.将/stu/students.txt文件拷贝到本地
hadoop dfs -copyToLocal /stu/students.txt
9.将word.txt文件拷贝到/wordcount/input/目录
hadoop dfs -copyFromLocal word.txt /wordcount/input
10.将word.txt文件从本地移动到/wordcount/input/目录下
hadoop dfs -moveFromLocal word.txt /wordcount/input/
11.将/stu/students.txt拷贝一份为/stu/students.txt.bak
hadoop dfs -cp /stu/students.txt /stu/students.txt.bak
12.将/flume/tailout/目录下的子目录或文件都拷贝到/logs目录（如果此目录不存在会创建）下
hadoop dfs -cp /flume/tailout/ /logs
13.将/word.txt文件重命名为/words.txt
hadoop dfs -mv /word.txt /words.txt
14.将/words.txt文件移动到/wordcount/input/目录下
hadoop dfs -mv /words.txt /wordcount/input/
15.将/ws目录以及子目录和文件都删除（谨慎使用）
hadoop dfs -rm -r /ws
16.删除以"xbs-"开头的目录及其子目录
hadoop dfs -rm -r /xbs-*
17.将/wordcount/output2/目录下的a.txt文件删除
hadoop dfs -rm /wordcount/output2/a.txt
18.将/wordcount/input/目录下面的所有文件都删除
hadoop dfs -rm /wordcount/input/*
19.查看HDFS集群的磁盘空间使用情况
hadoop dfs -df -h
20.查看/word.txt文件的内容
hadoop dfs -cat /word.txt
21.将name.txt文件中的内容添加到/wordcount/input/words.txt文件中
hadoop dfs -appendToFile name.txt /wordcount/input/words.txt
22.动态查看/wordcount/input/words.txt文件的内容
hadoop dfs -tail -f /wordcount/input/words.txt
23.统计/flume目录总大小
hadoop dfs -du -s -h /flume
24.分别统计/flume目录下各个子目录（或文件）大小
hadoop dfs -du -s -h /flume/*
25.运行jar包中的程序
//hadoop jar + 要执行的jar包 + 要运行的类 + 输入目录 + 输出目录
hadoop jar wordcount.jar com.xuebusi.hadoop.mr.WordCountDriver /wordcount/input
/wordcount/out
26.查看hdfs集群状态
hdfs dfsadmin -report
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27.查看hadoop fs命令使用帮助
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