HDFS Shell基本操作

1、目录操作#

hdfs dfs [命令] [命令] 等价于 hadoop fs [] []

1 ./bin/hdfs dfs -mkdir -p /user/hadoop 基本操作在hadoop目录bin中hdfs 后跟dfs

-mkdir 创建目录 -p代表创建多级目录

2 hadoop fs -ls . "."表示当前用户目录

3 hadoop fs -mkdir /input 创建input目录

4 hadoop fs -rm -r /input 删除input目录 -r 表示删除目录和目录下的所有文件

2. 文件操作#

hadoop fs -put test.text / 将本地文件上传到hadoop根目录

hadoop fs -cat /test.text 查看文件内容

./bin/hdfs dfs -cat /dbtaobao/dataset/user_log/small_user_log.csv | head -10 查看前十行

hadoop fs -get /test.text ~/date/ //将hdfs文件下载到本地

hadoop fs -cp /test.text /hello //复制一份

其他命令 Hadoop fs 回车看注解

   [-appendToFile <localsrc> ... <dst>]
   [-cat [-ignoreCrc] <src> ...] //查看内容
   [-checksum <src> ...]
   [-chgrp [-R] GROUP PATH...]
   [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
   [-chown [-R] [OWNER][:[GROUP]] PATH...]
   [-copyFromLocal [-f] [-p] [-l] <localsrc> ... <dst>] //从本地复制
   [-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] //复制到本地
   [-count [-q] [-h] [-v] <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>] //拿到
   [-getfacl [-R] <path>]
   [-getfattr [-R] {-n name | -d} [-e en] <path>]
   [-getmerge [-nl] <src> <localdst>]
   [-help [cmd ...]]
   [-ls [-d] [-h] [-R] [<path> ...]] //查看目录需要有目录  hadoop fs -ls /
   [-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> ...]
   [-usage [cmd ...]]