dfs 是fs 的实现类
hadoop dfs
[-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] <localsrc> ... <dst>]
[-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] <path> ...]
[-cp [-f] [-p] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] <path> ...]
[-expunge]
[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <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] <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>]]
[-setrep [-R] [-w] <rep> <path> ...]
[-stat [format] <path> ...]
[-tail [-f] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touchz <path> ...]
[-usage [cmd ...]]
查看目录 ：hadoop dfs -ls [-R] /
创建目录 ：hadoop dfs -mkdir [-p] /user/files
从本地剪切粘贴到hdfs上：hadoop dfs -moveFromLocal /home/hello.txt /user/files/
文件追加到末尾：hadoop dfs -appendToFile /home/word.txt /user/files/hello.txt
查看文件内容：hadoop dfs -cat /user/files/hello.txt
修改文件所属组：hadoop dfs -chgrp hadoop /user/files/hello.txt
修改文件拥有者：hadoop dfs -chown hive:hive /user/files/hello.txt
修改文件权限：hadoop dfs -chmod 755 hive:hive /user/files/hello.txt
从本地拷贝到hdfs：hadoop dfs -copyFromLocal /home/hi.txt /user/files/
hadoop dfs -put /home/hi.txt /user/files/
从hdfs下载到本地：hadoop dfs -copyToLocal /user/files/hello.txt /home/text/
hadoop dfs -get /user/files/hi.txt /home/text/
拷贝文件：hadoop dfs -cp /user/files/hello.txt /user/
文件移动：hadoop dfs -mv /user/files/hello.txt /user/
多个文件合并到本地：hadoop dfs -getmerge /user/files/* /home/text/merge.txt
显示一个文件的末尾：hadoop dfs -tail /user/files/hello.txt
删除文件或文件夹：hadoop dfs -rm [-r] /user/files/hi.txt
删除空文件夹：hadoop dfs -rmdir /user/files
统计文件夹的大小信息：hadoop dfs -du -h /user
统计文件夹的总大小：hadoop dfs -du -h -s /user
设置HDFS文件的副本数为2：hadoop dfs -setrep 2 /user/files/hello.txt
