1、基本文法
bin/hadoop fs 具體指令
2、參數大全
bin/hadoop fs
[-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 ...]]
3、常用指令實操
(1)-help:輸出這個指令參數
bin/hdfs dfs -help rm
(2)-ls: 顯示目錄資訊
hadoop fs -ls /
(3)-mkdir:在hdfs上建立目錄
hadoop fs -mkdir -p /aaa/bbb/cc/dd
(4)-moveFromLocal從本地剪切粘貼到hdfs
hadoop fs - moveFromLocal /home/hadoop/a.txt /aaa/bbb/cc/dd
(5)-moveToLocal:從hdfs剪切粘貼到本地
hadoop fs - moveToLocal /aaa/bbb/cc/dd /home/hadoop/a.txt
(6)--appendToFile :追加一個檔案到已經存在的檔案末尾
hadoop fs -appendToFile ./hello.txt /hello.txt
(7)-cat :顯示檔案内容
(8)-tail:顯示一個檔案的末尾
hadoop fs -tail /weblog/access_log.1
(9)-text:以字元形式列印一個檔案的内容
hadoop fs -text /weblog/access_log.1
(10)-chgrp 、-chmod、-chown:linux檔案系統中的用法一樣,修改檔案所屬權限
hadoop fs -chmod 666 /hello.txt
hadoop fs -chown someuser:somegrp /hello.txt
(11)-copyFromLocal:從本地檔案系統中拷貝檔案到hdfs路徑去
hadoop fs -copyFromLocal ./jdk.tar.gz /aaa/
(12)-copyToLocal:從hdfs拷貝到本地
hadoop fs -copyToLocal /aaa/jdk.tar.gz
(13)-cp :從hdfs的一個路徑拷貝到hdfs的另一個路徑
hadoop fs -cp /aaa/jdk.tar.gz /bbb/jdk.tar.gz.2
(14)-mv:在hdfs目錄中移動檔案
hadoop fs -mv /aaa/jdk.tar.gz /
(15)-get:等同于copyToLocal,就是從hdfs下載下傳檔案到本地
hadoop fs -get /aaa/jdk.tar.gz
(16)-getmerge :合并下載下傳多個檔案,比如hdfs的目錄 /aaa/下有多個檔案:log.1, log.2,log.3,...
hadoop fs -getmerge /aaa/log.* ./log.sum
(17)-put:等同于copyFromLocal
hadoop fs -put /aaa/jdk.tar.gz /bbb/jdk.tar.gz.2
(18)-rm:删除檔案或檔案夾
hadoop fs -rm -r /aaa/bbb/
(19)-rmdir:删除空目錄
hadoop fs -rmdir /aaa/bbb/ccc
(20)-df :統計檔案系統的可用空間資訊
hadoop fs -df -h /
(21)-du統計檔案夾的大小資訊
hadoop fs -du -s -h /aaa/*
(22)-count:統計一個指定目錄下的檔案節點數量
hadoop fs -count /aaa/