(0)启动Hadoop集群
?sbin/start-dfs.sh
sbin/start-yarn.sh
(1)-help:输出这个命令参数
?hadoop fs -help rm
(2)-ls: 显示目录信息
?hadoop fs -ls /
(3)-mkdir:在HDFS上创建目录
?hadoop fs -mkdir -p /sanguo/shuguo
(4)-moveFromLocal:从本地剪切粘贴到HDFS
?touch kongming.txt
?hadoop fs ?-moveFromLocal ?./kongming.txt ?/sanguo/shuguo
(5)-appendToFile:追加一个文件到已经存在的文件末尾
?touch liubei.txt
?vi liubei.txt
输入
san gu mao lu
hadoop fs -appendToFile liubei.txt /sanguo/shuguo/kongming.txt
(6)-cat:显示文件内容
hadoop fs -cat /sanguo/shuguo/kongming.txt
(7)-chgrp 、-chmod、-chown:Linux文件系统中的用法一样,修改文件所属权限
hadoop fs ?-chmod ?666 ?/sanguo/shuguo/kongming.txt
hadoop fs ?-chown ?angel:angel? ?/sanguo/shuguo/kongming.txt
(8)-copyFromLocal:从本地文件系统中拷贝文件到HDFS路径去
hadoop fs -copyFromLocal README.txt /
(9)-copyToLocal:从HDFS拷贝到本地
hadoop fs -copyToLocal /sanguo/shuguo/kongming.txt ./
(10)-cp :从HDFS的一个路径拷贝到HDFS的另一个路径
hadoop fs -cp /sanguo/shuguo/kongming.txt /zhuge.txt
(11)-mv:在HDFS目录中移动文件
hadoop fs -mv /zhuge.txt /sanguo/shuguo/
(12)-get:等同于copyToLocal,就是从HDFS下载文件到本地
hadoop fs -get /sanguo/shuguo/kongming.txt ./
(13)-getmerge:合并下载多个文件,比如HDFS的目录 /user/atguigu/test下有多个文件:log.1, log.2,log.3,...
hadoop fs -getmerge /user/angel/test/* ./zaiyiqi.txt
(14)-put:等同于copyFromLocal
hadoop fs -put ./zaiyiqi.txt /user/angel/test/
(15)-tail:显示一个文件的末尾
hadoop fs -tail /sanguo/shuguo/kongming.txt
(16)-rm:删除文件或文件夹
hadoop fs -rm /user/angel/test/jinlian2.txt
(17)-rmdir:删除空目录
hadoop fs -mkdir /test
hadoop fs -rmdir /test
(18)-du统计文件夹的大小信息
hadoop fs -du -s -h /user/angel/test
hadoop fs -du ?-h /user/angel/test
(19)-setrep:设置HDFS中文件的副本数量
hadoop fs -setrep 10 /sanguo/shuguo/kongming.txt
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