标签：mapred orm 输出 tar nbsp rename 改变 cat test
可以执行所有常用的Linux文件操作命令（读取文件，新建文件，移动文件，删除文件，列表文件等）
1.help命令获取没个命令的帮助
[cloudera@quickstart ~]$ hadoop fs -help 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] [-v] [-x] <path> ...] [-cp [-f] [-p | -p[topax]] <src> ... <dst>] [-createSnapshot <snapshotDir> [<snapshotName>]] [-deleteSnapshot <snapshotDir> <snapshotName>] [-df [-h] [<path> ...]] [-du [-s] [-h] [-x] <path> ...] [-expunge] [-find <path> ... <expression> ...] [-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] [-getfacl [-R] <path>] [-getfattr [-R] {-n name | -d} [-e en] <path>] [-getmerge [-nl] <src> <localdst>] [-help [cmd ...]] [-ls [-C] [-d] [-h] [-q] [-R] [-t] [-S] [-r] [-u] [<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 ...]]
2.copyFromLocal复制本地文件到hdfs中，其中“hdfs://quickstart.cloudera:8020”可以省略
[cloudera@quickstart Downloads]$ hadoop fs -copyFromLocal file1.txt hdfs://quickstart.cloudera:8020/tmp [cloudera@quickstart Downloads]$ hadoop fs -copyFromLocal file2.txt /tmp
3.copyToLocal把hdfs中文件复制到本地文件系统
[cloudera@quickstart Downloads]$ hadoop fs -copyToLocal hdfs://quickstart.cloudera:8020/tmp/file1.txt file1.txt.copy
4.ls列出当前目录下的文件（第一列：文件权限，第二列：文件的备份书，第三列：所属用户，第四列：所属组，第五列：文件大小，第六列：最后修改日期，第七列：文件或目录）
[cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 7 items drwxrwxrwx - hdfs supergroup 0 2018-04-26 15:40 /tmp/.cloudera_health_monitoring_canary_files -rw-r--r-- 1 cloudera supergroup 12 2018-04-26 15:35 /tmp/file1.txt -rw-r--r-- 1 cloudera supergroup 29 2018-04-26 15:36 /tmp/file2.txt drwxrwxrwt - mapred mapred 0 2018-04-13 21:30 /tmp/hadoop-yarn drwx--x--x - hbase supergroup 0 2018-04-12 15:36 /tmp/hbase-staging drwx-wx-wx - hive supergroup 0 2018-04-13 19:02 /tmp/hive drwxrwxrwt - mapred hadoop 0 2018-04-12 17:05 /tmp/logs
5.cat输出文件内容
[cloudera@quickstart Downloads]$ hadoop fs -cat /tmp/file1.txt hello world
6.mkdir创建目录
[cloudera@quickstart Downloads]$ hadoop fs -mkdir /tmp/test [cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 8 items drwxrwxrwx - hdfs supergroup 0 2018-04-26 15:54 /tmp/.cloudera_health_monitoring_canary_files -rw-r--r-- 1 cloudera supergroup 12 2018-04-26 15:35 /tmp/file1.txt -rw-r--r-- 1 cloudera supergroup 29 2018-04-26 15:36 /tmp/file2.txt drwxrwxrwt - mapred mapred 0 2018-04-13 21:30 /tmp/hadoop-yarn drwx--x--x - hbase supergroup 0 2018-04-12 15:36 /tmp/hbase-staging drwx-wx-wx - hive supergroup 0 2018-04-13 19:02 /tmp/hive drwxrwxrwt - mapred hadoop 0 2018-04-12 17:05 /tmp/logs drwxr-xr-x - cloudera supergroup 0 2018-04-26 15:54 /tmp/test
7.rm删除文件或者目录
[cloudera@quickstart Downloads]$ hadoop fs -rm /tmp/file1.txt 删除文件 18/04/26 15:55:44 INFO fs.TrashPolicyDefault: Moved: ‘hdfs://quickstart.cloudera:8020/tmp/file1.txt‘ to trash at: hdfs://quickstart.cloudera:8020/user/cloudera/.Trash/Current/tmp/file1.txt [cloudera@quickstart Downloads]$ hadoop fs -rm -r /tmp/test 删除目录 18/04/26 15:56:01 INFO fs.TrashPolicyDefault: Moved: ‘hdfs://quickstart.cloudera:8020/tmp/test‘ to trash at: hdfs://quickstart.cloudera:8020/user/cloudera/.Trash/Current/tmp/test
8.put同copyFromLocal
[cloudera@quickstart Downloads]$ hadoop fs -put file1.txt /tmp
9.get通copyToLocal
[cloudera@quickstart Downloads]$ hadoop fs -get hdfs://quickstart.cloudera:8020/tmp/file1.txt get1.txt [cloudera@quickstart Downloads]$ ls 1901.gz 1902.gz all compute_max_degree.sh file1.txt file1.txt.copy file2.txt get1.txt
10.mv移动文件
[cloudera@quickstart Downloads]$ hadoop fs -mv /tmp/file1.txt /tmp/file1_new.txt [cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 8 items drwxrwxrwx - hdfs supergroup 0 2018-04-26 16:08 /tmp/.cloudera_health_monitoring_canary_files -rw-r--r-- 1 cloudera supergroup 12 2018-04-26 16:05 /tmp/file1_new.txt -rw-r--r-- 1 cloudera supergroup 29 2018-04-26 15:36 /tmp/file2.txt drwxrwxrwt - mapred mapred 0 2018-04-13 21:30 /tmp/hadoop-yarn drwx--x--x - hbase supergroup 0 2018-04-12 15:36 /tmp/hbase-staging drwx-wx-wx - hive supergroup 0 2018-04-13 19:02 /tmp/hive drwxrwxrwt - mapred hadoop 0 2018-04-12 17:05 /tmp/logs drwxr-xr-x - cloudera supergroup 0 2018-04-26 16:04 /tmp/test
11.du显示文件大小
[cloudera@quickstart Downloads]$ hadoop fs -du /tmp/file2.txt 29 29 /tmp/file2.txt
12.touchz创建空文件
[cloudera@quickstart Downloads]$ hadoop fs -touchz /tmp/file3.txt [cloudera@quickstart Downloads]$ hadoop fs -du /tmp/file3.txt 0 0 /tmp/file3.txt
13.chmod改变文件权限
[cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 1 items
-rw-r--r-- 1 cloudera supergroup 0 2018-04-26 16:12 /tmp/file3.txt [cloudera@quickstart Downloads]$ hadoop fs -chmod +x /tmp/file3.txt [cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 1 items-rwxr-xr-x 1 cloudera supergroup 0 2018-04-26 16:12 /tmp/file3.txt
14.chown改变文件所有者
[cloudera@quickstart Downloads]$ hadoop fs -chown -R hbase:supergroup /tmp/file3.txt chown: changing ownership of ‘/tmp/file3.txt‘: Non-super user cannot change owner [cloudera@quickstart Downloads]$ sudo -u hdfs hadoop fs -chown -R hbase:supergroup /tmp/file3.txt [cloudera@quickstart Downloads]$ hadoop fs -ls /tmp Found 9 items drwxrwxrwx - hdfs supergroup 0 2018-04-26 16:19 /tmp/.cloudera_health_monitoring_canary_files -rw-r--r-- 1 cloudera supergroup 12 2018-04-26 16:05 /tmp/file1_new.txt -rw-r--r-- 1 cloudera supergroup 29 2018-04-26 15:36 /tmp/file2.txt -rwxr-xr-x 1 hbase supergroup 0 2018-04-26 16:12 /tmp/file3.txt drwxrwxrwt - mapred mapred 0 2018-04-13 21:30 /tmp/hadoop-yarn drwx--x--x - hbase supergroup 0 2018-04-12 15:36 /tmp/hbase-staging drwx-wx-wx - hive supergroup 0 2018-04-13 19:02 /tmp/hive drwxrwxrwt - mapred hadoop 0 2018-04-12 17:05 /tmp/logs drwxr-xr-x - cloudera supergroup 0 2018-04-26 16:04 /tmp/test
标签：mapred orm 输出 tar nbsp rename 改变 cat test
原文地址：https://www.cnblogs.com/qizhelongdeyang/p/8960668.html
