Hadoop 学习笔记（三）常用命令

进入HADOOP_HOME目录。执行sh bin/start-all.sh

进入HADOOP_HOME目录。执行sh bin/stop-all.sh

Usage: java FsShell

[-ls <path>]

[-lsr <path>]

[-du <path>]

[-dus <path>]

[-count[-q] <path>]

[-mv <src> <dst>]

[-cp <src> <dst>]

[-rm [-skipTrash] <path>]

[-rmr [-skipTrash] <path>]

[-expunge]

[-put <localsrc> ... <dst>]

[-copyFromLocal <localsrc> ... <dst>]

[-moveFromLocal <localsrc> ... <dst>]

[-get [-ignoreCrc] [-crc] <src> <localdst>]

[-getmerge <src> <localdst> [addnl]]

[-cat <src>]

[-text <src>]

[-copyToLocal [-ignoreCrc] [-crc] <src> <localdst>]

[-moveToLocal [-crc] <src> <localdst>]

[-mkdir <path>]

[-setrep [-R] [-w] <rep> <path/file>]

[-touchz <path>]

[-test -[ezd] <path>]

[-stat [format] <path>]

[-tail [-f] <file>]

[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]

[-chown [-R] [OWNER][:[GROUP]] PATH...]

[-chgrp [-R] GROUP PATH...]

[-help [cmd]]

1、查看指定目录下内容

hadoop dfs –ls [文件目录]

eg: hadoop dfs –ls /user/wangkai.pt

2、打开某个已存在文件

hadoop dfs –cat [file_path]

eg:hadoop dfs -cat /user/wangkai.pt/data.txt

3、将本地文件存储至hadoop

hadoop fs –put [本地地址] [hadoop目录]

hadoop fs –put /home/t/file.txt /user/t

(file.txt是文件名)

4、将本地文件夹存储至hadoop

hadoop fs –put [本地目录] [hadoop目录]

hadoop fs –put /home/t/dir_name /user/t

(dir_name是文件夹名)

5、将hadoop上某个文件down至本地已有目录下

hadoop fs -get [文件目录] [本地目录]

hadoop fs –get /user/t/ok.txt /home/t

6、删除hadoop上指定文件

hadoop fs –rm [文件地址]

hadoop fs –rm /user/t/ok.txt

7、删除hadoop上指定文件夹（包含子目录等）

hadoop fs –rm [目录地址]

hadoop fs –rmr /user/t

8、在hadoop指定目录内创建新目录

hadoop fs –mkdir /user/t

9、在hadoop指定目录下新建一个空文件

使用touchz命令：

hadoop fs -touchz /user/new.txt

10、将hadoop上某个文件重命名

使用mv命令：

hadoop fs –mv /user/test.txt /user/ok.txt （将test.txt重命名为ok.txt）

11、将hadoop指定目录下所有内容保存为一个文件，同时down至本地

hadoop dfs –getmerge /user /home/t

12、将正在运行的hadoop作业kill掉

hadoop job –kill [job-i