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基本语法
hadoop fs 具体命令
hdfs dfs 具体命令
[root@master ~]# hadoop fs -help rm
先启动集群
sbin/start-dfs.sh
[root@master hadoop-3.1.3]# hadoop fs -mkdir /sanguo
[root@master hadoop-3.1.3]# vim shuguo.txt
上传
1）-moveFromLocal: 从本地剪切粘贴到HDFS
[root@master hadoop-3.1.3]# hadoop fs -moveFromLocal ./shuguo.txt /sanguo
2）-copyFromLocal: 从本地文件系统中拷贝文件到HDFS路径去
[root@master hadoop-3.1.3]# hadoop fs -copyFromLocal ./weiguo.txt /sanguo
3）-put: 等同于copyFromLocal，生产环境更习惯用put
[root@master hadoop-3.1.3]# hadoop fs -put ./wuguo.txt /sanguo
4）-appendToFile: 追加一个文件到已经存在的文件末尾
[root@master hadoop-3.1.3]# hadoop fs -appendToFile liubei.txt /sanguo/shuguo.txt
下载
1）copyToLocal: 从HDFS拷贝到本地
[root@master hadoop-3.1.3]# hadoop fs -copyToLocal /sanguo/shuguo.txt ./
2）get：等同于copyToLocal，生产环境更习惯用get
[root@master hadoop-3.1.3]# hadoop fs -get /sanguo/shuguo.txt ./shuguo2.txt
直接操作
1）-ls：显示目录信息
[root@master hadoop-3.1.3]# hadoop fs -ls /
[root@master hadoop-3.1.3]# hadoop fs -ls /sanguo
2）-cat：显示文件内容
[root@master hadoop-3.1.3]# hadoop fs -cat /sanguo/shuguo.txt
3）-chgrp、-chmod、-chown：修改文件所属权限
[root@master hadoop-3.1.3]# hadoop fs -chown root:root /sanguo/shuguo.txt
4）-mkdir：创建路径
[root@master hadoop-3.1.3]# hadoop fs -mkdir /jinguo
5）-cp：从HDFS的一个路径拷贝到HDFS的另一个路径
[root@master hadoop-3.1.3]# hadoop fs -cp /sanguo/shuguo.txt /jinguo
6）-mv：在HDFS目录中移动文件
[root@master hadoop-3.1.3]# hadoop fs -mv /sanguo/wuguo.txt /jinguo
[root@master hadoop-3.1.3]# hadoop fs -mv /sanguo/weiguo.txt /jinguo
7）-tail：显示一个文件的末尾1kb的数据
[root@master hadoop-3.1.3]# hadoop fs -tail /jinguo/shuguo.txt
8）-rm：删除文件或文件夹
[root@master hadoop-3.1.3]# hadoop fs -rm /sanguo/shuguo.txt
9）-rm -r：递归删除目录及目录里面内容
[root@master hadoop-3.1.3]# hadoop fs -rm -r /sanguo
10）-du：统计文件夹的大小信息
[root@master hadoop-3.1.3]# hadoop fs -du -s -h /jinguo 27 81 /jinguo [root@master hadoop-3.1.3]# hadoop fs -du -h /jinguo 14 42 /jinguo/shuguo.txt 7 21 /jinguo/weiguo.txt 6 18 /jinguo/wuguo.txt
11）-setrep：设置HDFS中文件的副本数量
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