仅供自己学习和大家参考
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[lqs@bdc112 hadoop-3.1.3]$ bin/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] [-d] [-t <thread count>] <localsrc> ... <dst>]
[-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] [-h] [-v] [-t [<storage type>]] [-u] [-x] [-e] <path> ...]
[-cp [-f] [-p | -p[topax]] [-d] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] [-v] [-x] <path> ...]
[-expunge]
[-find <path> ... <expression> ...]
[-get [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <path>]
[-getfattr [-R] {-n name | -d} [-e en] <path>]
[-getmerge [-nl] [-skip-empty-file] <src> <localdst>]
[-head <file>]
[-help [cmd ...]]
[-ls [-C] [-d] [-h] [-q] [-R] [-t] [-S] [-r] [-u] [-e] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]
[-mv <src> ... <dst>]
[-put [-f] [-p] [-l] [-d] <localsrc> ... <dst>]
[-renameSnapshot <snapshotDir> <oldName> <newName>]
[-rm [-f] [-r|-R] [-skipTrash] [-safely] <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] [-s <sleep interval>] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touch [-a] [-m] [-t TIMESTAMP ] [-c] <path> ...]
[-touchz <path> ...]
[-truncate [-w] <length> <path> ...]
[-usage [cmd ...]]
Generic options supported are:
-conf <configuration file> specify an application configuration file
-D <property=value> define a value for a given property
-fs <file:///|hdfs://namenode:port> specify default filesystem URL to use, overrides 'fs.defaultFS' property from configurations.
-jt <local|resourcemanager:port> specify a ResourceManager
-files <file1,...> specify a comma-separated list of files to be copied to the map reduce cluster
-libjars <jar1,...> specify a comma-separated list of jar files to be included in the classpath
-archives <archive1,...> specify a comma-separated list of archives to be unarchived on the compute machines
The general command line syntax is:
command [genericOptions] [commandOptions]
上传
1、-moveFromLocal：从本地剪切粘贴到 HDFS
[lqs@bdc112 hadoop-3.1.3]$ vim test.txt
输入：
test
test1
test2
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -moveFromLocal ./test.txt /test
2、-copyFromLocal：从本地文件系统中拷贝文件到 HDFS 路径去
[lqs@bdc112 hadoop-3.1.3]$ vim test1.txt
输入：
test1.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -copyFromLocal test1.txt /test
3、-put：等同于 copyFromLocal，生产环境更习惯用 put
[lqs@bdc112 hadoop-3.1.3]$ vim test2.txt
输入：
test2.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -put ./test2.txt /test
4、-appendToFile：追加一个文件到已经存在的文件末尾
[lqs@bdc112 hadoop-3.1.3]$ vim test3.txt
输入：
test3.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -appendToFile test3.txt /test/test2.txt
下载
1、-copyToLocal：从 HDFS 拷贝到本地
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -moveFromLocal test.txt /test
2、-get：等同于 copyToLocal，生产环境更习惯用 get
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -get /test/test2.txt ./test2-1.txt
#显示上面追加的内容
[lqs@bdc112 hadoop-3.1.3]$ cat test2-1.txt
test2.txt
test3.txt
HDFS的 直接操作
1、-ls: 显示目录信息
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -ls /test
Found 3 items
-rw-r--r-- 3 lqs supergroup 17 2021-12-10 10:29 /test/test.txt
-rw-r--r-- 3 lqs supergroup 10 2021-12-10 13:11 /test/test1.txt
-rw-r--r-- 3 lqs supergroup 20 2021-12-10 13:14 /test/test2.txt
2、-cat：显示文件内容
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -cat /test/test2.txt
2021-12-10 13:19:52,404 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false
test2.txt
test3.txt
3、-chgrp、-chmod、-chown：Linux 文件系统中的用法一样，修改文件所属权限
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -chmod 777 /test/test.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -ls /test
-rwxrwxrwx 3 lqs supergroup 17 2021-12-10 10:29 /test/test.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -chown root:root /test/test1.txt
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -ls /test
-rw-r--r-- 3 root root 10 2021-12-10 13:11 /test/test1.txt
4、-mkdir：创建路径
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -mkdir /test1
5、-cp：从 HDFS 的一个路径拷贝到 HDFS 的另一个路径
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -cp /test/test.txt /test1
2021-12-10 13:23:34,988 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false
2021-12-10 13:23:35,096 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false
6、-mv：在 HDFS 目录中移动文件
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -mv /test/test1.txt /test1
7、-tail：显示一个文件的末尾 1kb 的数据
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -tail /test/test.txt
2021-12-10 13:25:34,761 INFO sasl.SaslDataTransferClient: SASL encryption trust check: localHostTrusted = false, remoteHostTrusted = false
test
test1
test2
8、-rm：删除文件或文件夹
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -rm /test/test.txt
2021-12-10 13:26:08,316 INFO fs.TrashPolicyDefault: Moved: 'hdfs://bdc112:8020/test/test.txt' to trash at: hdfs://bdc112:8020/user/lqs/.Trash/Current/test/test.txt
9、-rm -r：递归删除目录及目录里面内容
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -rm -r /test1
2021-12-10 13:26:54,488 INFO fs.TrashPolicyDefault: Moved: 'hdfs://bdc112:8020/test1' to trash at: hdfs://bdc112:8020/user/lqs/.Trash/Current/test1
10、-du 统计文件夹的大小信息
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -du -s -h /test
20 60 /test
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -du -h /test
20 60 /test/test2.txt
#说明：20 表示文件大小；60 表示 20*3 个副本；/jinguo 表示查看的目录
11 -setrep：设置 HDFS 中文件的副本数量
[lqs@bdc112 hadoop-3.1.3]$ hadoop fs -setrep 10 /test/test2.txt
Replication 10 set: /test/test2.txt
