尚硅谷大数据技术之Hadoop（HDFS）第2章 HFDS的Shell操作
1）基本语法
bin/hadoop fs 具体命令
2）命令大全
[atguigu@hadoop102 hadoop-2.7.2]$ 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）常用命令实操
（0）启动Hadoop集群（方便后续的测试）
[atguigu@hadoop102 hadoop-2.7.2]$ sbin/start-dfs.sh
[atguigu@hadoop103 hadoop-2.7.2]$ sbin/start-yarn.sh
（1）-help：输出这个命令参数
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -help rm
（2）-ls: 显示目录信息
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -ls /
（3）-mkdir：在hdfs上创建目录
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -mkdir -p /sanguo/shuguo
（4）-moveFromLocal从本地剪切粘贴到hdfs
[atguigu@hadoop102 hadoop-2.7.2]$ touch kongming.txt
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -moveFromLocal ./kongming.txt /sanguo/shuguo
（5）--appendToFile ：追加一个文件到已经存在的文件末尾
[atguigu@hadoop102 hadoop-2.7.2]$ touch liubei.txt
[atguigu@hadoop102 hadoop-2.7.2]$ vi liubei.txt
输入
san gu mao lu
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -appendToFile liubei.txt /sanguo/shuguo/kongming.txt
- -cat ：显示文件内容
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -cat /sanguo/shuguo/kongming.txt
（7）-tail：显示一个文件的末尾
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -tail /sanguo/shuguo/kongming.txt
（8）-chgrp 、-chmod、-chown：linux文件系统中的用法一样，修改文件所属权限
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -chmod 666 /sanguo/shuguo/kongming.txt
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -chown atguigu:atguigu /sanguo/shuguo/kongming.txt
（9）-copyFromLocal：从本地文件系统中拷贝文件到hdfs路径去
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -copyFromLocal README.txt /
（10）-copyToLocal：从hdfs拷贝到本地
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -copyToLocal /sanguo/shuguo/kongming.txt ./
（11）-cp ：从hdfs的一个路径拷贝到hdfs的另一个路径
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -cp /sanguo/shuguo/kongming.txt /zhuge.txt
（12）-mv：在hdfs目录中移动文件
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -mv /zhuge.txt /sanguo/shuguo/
（13）-get：等同于copyToLocal，就是从hdfs下载文件到本地
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -get /sanguo/shuguo/kongming.txt ./
（14）-getmerge ：合并下载多个文件，比如hdfs的目录 /aaa/下有多个文件:log.1, log.2,log.3,...
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -getmerge /user/atguigu/test/* ./zaiyiqi.txt
（15）-put：等同于copyFromLocal
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -put ./zaiyiqi.txt /user/atguigu/test/
（16）-rm：删除文件或文件夹
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -rm /user/atguigu/test/jinlian2.txt
（17）-rmdir：删除空目录
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -mkdir /test
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -rmdir /test
（18）-du统计文件夹的大小信息
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -du -s -h /user/atguigu/test
2.7 K /user/atguigu/test
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -du -h /user/atguigu/test
1.3 K /user/atguigu/test/README.txt
15 /user/atguigu/test/jinlian.txt
1.4 K /user/atguigu/test/zaiyiqi.txt
（19）-setrep：设置hdfs中文件的副本数量
[atguigu@hadoop102 hadoop-2.7.2]$ hadoop fs -setrep 10 /sanguo/shuguo/kongming.txt
这里设置的副本数只是记录在NameNode的元数据中，是否真的会有这么多副本，还得看DataNode的数量。因为目前只有3台设备，最多也就3个副本，只有节点数的增加到10台时，副本数才能达到10。
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