Hadoop HDFS操作命令总结
1.列出根目录下所有的目录或文件
hadoop fs -ls /
2.列出/logs目录下的所有目录和文件
hadoop fs -ls /logs
3.列出/user目录及其子目录下的所有文件（谨慎使用）
hadoop fs -ls -R /user
4.创建/soft目录
hadoop fs -mkdir /soft
5.创建多级目录
hadoop fs -mkdir -p /apps/windows/2017/01/01
6.将本地的wordcount.jar文件上传到/wordcount目录下
hadoop fs -put wordcount.jar /wordcount
7.下载words.txt文件到本地
hadoop fs -get /words.txt
8.将/stu/students.txt文件拷贝到本地
hadoop fs -copyToLocal /stu/students.txt
9.将word.txt文件拷贝到/wordcount/input/目录
hadoop fs -copyFromLocal word.txt /wordcount/input
10.将word.txt文件从本地移动到/wordcount/input/目录下
hadoop fs -moveFromLocal word.txt /wordcount/input/
11.将/stu/students.txt拷贝一份为/stu/students.txt.bak
hadoop fs -cp /stu/students.txt /stu/students.txt.bak
12.将/flume/tailout/目录下的子目录或文件都拷贝到/logs目录（如果此目录不存在会创建）下
hadoop fs -cp /flume/tailout/ /logs
13.将/word.txt文件重命名为/words.txt
hadoop fs -mv /word.txt /words.txt
14.将/words.txt文件移动到/wordcount/input/目录下
hadoop fs -mv /words.txt /wordcount/input/
15.将/ws目录以及子目录和文件都删除（谨慎使用）
hadoop fs -rm -r /ws
16.删除以"xbs-"开头的目录及其子目录
hadoop fs -rm -r /xbs-*
17.将/wordcount/output2/目录下的a.txt文件删除
hadoop fs -rm /wordcount/output2/a.txt
18.将/wordcount/input/目录下面的所有文件都删除
hadoop fs -rm /wordcount/input/*
19.查看HDFS集群的磁盘空间使用情况
hadoop fs -df -h
20.查看/word.txt文件的内容
hadoop fs -cat /word.txt
21.将name.txt文件中的内容添加到/wordcount/input/words.txt文件中
hadoop fs -appendToFile name.txt /wordcount/input/words.txt
22.动态查看/wordcount/input/words.txt文件的内容
hadoop fs -tail -f /wordcount/input/words.txt
23.统计/flume目录总大小
hadoop fs -du -s -h /flume
24.分别统计/flume目录下各个子目录（或文件）大小
hadoop fs -du -s -h /flume/*
25.运行jar包中的程序
//hadoop jar + 要执行的jar包 + 要运行的类 + 输入目录 + 输出目录
hadoop jar wordcount.jar com.xuebusi.hadoop.mr.WordCountDriver /wordcount/input /wordcount/out
26.查看hdfs集群状态
hdfs dfsadmin -report
[root@hadoop03 apps]# hdfs dfsadmin -report Configured Capacity: 55737004032 (51.91 GB) Present Capacity: 15066578944 (14.03 GB) DFS Remaining: 14682021888 (13.67 GB) DFS Used: 384557056 (366.74 MB) DFS Used%: 2.55% Under replicated blocks: 7 Blocks with corrupt replicas: 0 Missing blocks: 0 ------------------------------------------------- Live datanodes (3): Name: 192.168.71.11:50010 (hadoop01) Hostname: hadoop01 Decommission Status : Normal Configured Capacity: 18579001344 (17.30 GB) DFS Used: 128180224 (122.24 MB) Non DFS Used: 16187543552 (15.08 GB) DFS Remaining: 2263277568 (2.11 GB) DFS Used%: 0.69% DFS Remaining%: 12.18% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Mon Jan 09 11:17:43 PST 2017 Name: 192.168.71.13:50010 (hadoop03) Hostname: hadoop03 Decommission Status : Normal Configured Capacity: 18579001344 (17.30 GB) DFS Used: 128196608 (122.26 MB) Non DFS Used: 13623074816 (12.69 GB) DFS Remaining: 4827729920 (4.50 GB) DFS Used%: 0.69% DFS Remaining%: 25.98% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Mon Jan 09 11:17:41 PST 2017 Name: 192.168.71.12:50010 (hadoop02) Hostname: hadoop02 Decommission Status : Normal Configured Capacity: 18579001344 (17.30 GB) DFS Used: 128180224 (122.24 MB) Non DFS Used: 10859806720 (10.11 GB) DFS Remaining: 7591014400 (7.07 GB) DFS Used%: 0.69% DFS Remaining%: 40.86% Configured Cache Capacity: 0 (0 B) Cache Used: 0 (0 B) Cache Remaining: 0 (0 B) Cache Used%: 100.00% Cache Remaining%: 0.00% Xceivers: 1 Last contact: Mon Jan 09 11:17:42 PST 2017
27.查看hadoop fs命令使用帮助
[root@hadoop01 hadoop]# 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] <localsrc> ... <dst>] [-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] [-count [-q] [-h] <path> ...] [-cp [-f] [-p | -p[topax]] <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>] [-getfattr [-R] {-n name | -d} [-e en] <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] [-l] <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>]] [-setfattr {-n name [-v value] | -x name} <path>] [-setrep [-R] [-w] <rep> <path> ...] [-stat [format] <path> ...] [-tail [-f] <file>] [-test -[defsz] <path>] [-text [-ignoreCrc] <src> ...] [-touchz <path> ...] [-usage [cmd ...]]