hadoop学习(六)----HDFS的shell操作

HDFS所有命令：

[uploaduser@rickiyang ~]$ hadoop fs

Usage: hadoop fs [generic options]

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

        [-cat [-ignoreCrc] <src> ...]

        [-checksum <src> ...]

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

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

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

        [-copyFromLocal [-f] [-p] [-l] <localsrc> ... <dst>]

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

        [-count [-q] [-h] <path> ...]

        [-cp [-f] [-p | -p[topax]] <src> ... <dst>]

        [-createSnapshot <snapshotDir> [<snapshotName>]]

        [-deleteSnapshot <snapshotDir> <snapshotName>]

        [-df [-h] [<path> ...]]

        [-du [-s] [-h] <path> ...]

        [-expunge]

        [-find <path> ... <expression> ...]

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

        [-getfacl [-R] <path>]

        [-getfattr [-R] {-n name | -d} [-e en] <path>]

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

        [-help [cmd ...]]

        [-ls [-d] [-h] [-R] [<path> ...]]

        [-mkdir [-p] <path> ...]

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

        [-moveToLocal <src> <localdst>]

        [-mv <src> ... <dst>]

        [-put [-f] [-p] [-l] <localsrc> ... <dst>]

        [-renameSnapshot <snapshotDir> <oldName> <newName>]

        [-rm [-f] [-r|-R] [-skipTrash] <src> ...]

        [-rmdir [--ignore-fail-on-non-empty] <dir> ...]

        [-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]

        [-setfattr {-n name [-v value] | -x name} <path>]

        [-setrep [-R] [-w] <rep> <path> ...]

        [-stat [format] <path> ...]

        [-tail [-f] <file>]

        [-test -[defsz] <path>]

        [-text [-ignoreCrc] <src> ...]

        [-touchz <path> ...]

        [-truncate [-w] <length> <path> ...]

        [-usage [cmd ...]]

Generic options supported are

-conf <configuration file>     specify an application configuration file

-D <property=value>            use value for given property

-fs <local|namenode:port>      specify a namenode

-jt <local|resourcemanager:port>    specify a ResourceManager

-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster

-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.

-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is

bin/hadoop command [genericOptions] [commandOptions]

1> –ls显示当前目录结构（从根路径开始）

[uploaduser@rickiyang ~]$ hadoop fs -ls /

2> -R递归显示目录结构

[uploaduser@rickiyang ~]$ hadoop fs -ls -R /

3> 创建带内容的文本

echo "hello world" > test1.txt

4> 上传文件

上传并重命名

[uploaduser@rickiyang tmp]$ hadoop fs -put t1.txt /tmp/test1.txt

上传文件夹

[uploaduser@rickiyang tmp]$ hadoop fs -put newPkg /tmp/pkg

一次上传多个文件

[uploaduser@rickiyang tmp]$ hadoop fs -put /tmp/t1.txt  /tmp/test1.txt

覆盖上传,如果根目录同一级有同名的文件则会覆盖，-f 表示强制覆盖

[uploaduser@rickiyang tmp]$ hadoop fs -put -f /tmp/test1.txt

5> 追加内容到文件末尾

[uploaduser@rickiyang tmp]$ hadoop fs -appendToFile /tmp/test2.txt

/user/uploadser/test1.txt

6> 查看HDFS某个文件的内容

[uploaduser@rickiyang tmp]$ hadoop fs -cat /user/uploaduser/test1.txt

7> 下载文件/目录

从HDFS到本地文件系统

[uploaduser@rickiyang ~]$ hadoop fs -get  /user/uploaduser/test2.txt /tmp/1.txt

与get等价的命令是copyToLocal

[uploaduser@rickiyang ~]$ hadoop fs -copyToLocal  /user/uploaduser/test2.txt /tmp/1.txt

其余的命令跟正常的linux命令大同小异，在实践中多多尝试。

巴特西

hadoop学习(六)----HDFS的shell操作

HDFS所有命令：

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