转自：https://blog.csdn.net/sjhuangx/article/details/79796388
Hadoop文件系统shell命令列表: https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/FileSystemShell.html
命令查看: hadoop fs
[hadoop@mini1 mapreduce]$ 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] <localsrc> ... <dst>]
[-copyToLocal [-f] [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] [-h] [-v] [-t [<storage type>]] [-u] [-x] <path> ...]
[-cp [-f] [-p | -p[topax]] [-d] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] [-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>]
[-help [cmd ...]]
[-ls [-C] [-d] [-h] [-q] [-R] [-t] [-S] [-r] [-u] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]1. hdfs文件上传
# 上传 XXX.zip 文件到 / 目录
hadoop fs -put XXX.zip /
2. 查看文件目录列表
[hadoop@mini1 ~]$ hadoop fs -ls /
Found 2 items
-rw-r--r-- 2 hadoop supergroup 354635831 2018-04-02 10:27 /jdk-9.0.4_linux-x64_bin.tar.gz
-rw-r--r-- 2 hadoop supergroup 279 2018-04-02 10:30 /test.txt
3. 获取文件 hadoop fs -get /XXX
[hadoop@mini2 ~]$ hadoop fs -get /jdk-9.0.4_linux-x64_bin.tar.gz
[hadoop@mini2 ~]$ ls
hadoop-2.9.0 hdfsdata jdk-9.0.4_linux-x64_bin.tar.gz
[hadoop@mini2 ~]$
4. 创建目录 hadoop fs -mkdir /XXX
[hadoop@mini1 ~]$ hadoop fs -mkdir /wordCount
[hadoop@mini1 ~]$ hadoop fs -ls /
Found 3 items
-rw-r--r-- 2 hadoop supergroup 354635831 2018-04-02 10:27 /jdk-9.0.4_linux-x64_bin.tar.gz
-rw-r--r-- 2 hadoop supergroup 279 2018-04-02 10:30 /test.txt
drwxr-xr-x - hadoop supergroup 0 2018-04-02 10:44 /wordCount
[hadoop@mini1 ~]$
5. 指定jar命令 hadoop jar XXX.jar YYY /wordCount/ /wordCount/output
[hadoop@mini1 mapreduce]$ hadoop jar hadoop-mapreduce-examples-2.9.0.jar wordcount /wordCount/ /wordCount/output
18/04/02 10:48:26 INFO client.RMProxy: Connecting to ResourceManager at mini1/192.168.241.100:8032
18/04/02 10:48:27 INFO input.FileInputFormat: Total input files to process : 2
18/04/02 10:48:28 INFO mapreduce.JobSubmitter: number of splits:2
18/04/02 10:48:28 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled
18/04/02 10:48:28 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1522678018314_0001
18/04/02 10:48:29 INFO impl.YarnClientImpl: Submitted application application_1522678018314_0001
18/04/02 10:48:29 INFO mapreduce.Job: The url to track the job: http://mini1:8088/proxy/application_1522678018314_0001/
18/04/02 10:48:29 INFO mapreduce.Job: Running job: job_1522678018314_0001
18/04/02 10:48:36 INFO mapreduce.Job: Job job_1522678018314_0001 running in uber mode : false
18/04/02 10:48:36 INFO mapreduce.Job: map 0% reduce 0%
18/04/02 10:48:48 INFO mapreduce.Job: map 100% reduce 0%
18/04/02 10:48:53 INFO mapreduce.Job: map 100% reduce 100%
18/04/02 10:48:54 INFO mapreduce.Job: Job job_1522678018314_0001 completed successfully
[hadoop@mini1 mapreduce]$ hadoop fs -cat /wordCount/output/part-r-00000
Apr 2
Don't 1
Jan 1
Mar 1
a 1
and 1
for 2
hadoop 9
[hadoop@mini1 mapreduce]$
6. 设置文件副本数 setrep
hadoop fs -setrep 10 XXX.yyy这里设置的文件副本数是指记录在namenode中的元数据，具体的副本数量还需要看集群中国是否有足够数量的机器存放，如果有则真实的副本数量为元数据中的数量，否则只能达到机器允许的最大数量。