Hadoop 命令行最常用指令篇：
1.ls (list directory)
Usage: hadoop fs -ls [R]
Option: -R => 递归显示
2.mkdir (make directory)
Usage: hadoop fs -mkdir [-p] <paths>
Takes path uri’s as argument and creates directories.
Options: -p make parent file => 当给的路径含有不存在的父目录时，递归创建目录
3.put (put local files to hdfs)
Usage: hadoop fs -put <localsrc> URI
4.get(make directory)
Usage: hadoop fs -get URI <localsrc>
5.rm(remove directory or file)
Usage: hadoop fs -rm [-f] [-r |-R] URI [URI ...]
Options:
- -f => force 强制删除，不给提示。
- -r |-R => recursively 递归删除所有目录中的文件。
Warning: hadoop fs -rm "-rf" 不能连在一起写，需要一个个给出：hadoop fs -rm -r -f
6.mv(move directory or file)
Usage: hadoop fs -mv URI [URI ...] <dest>
Feature: 支持多个目录或文件移动
