分布式系统详解--框架（Hadoop-基本shell命令）

前面的文章我们已经将一个集群搭建好了，现在就需要知道一些关于hadoop的基本操作命令，这篇文章就简单介绍一下hadoop的基本操作shell命令。

一、安装hadoop后，hadoop fs

在常用命令上进行了标注。

[root@MyLinux hadoop-2.7.5]# hadoop fs
Usage: hadoop fs [generic options]
        [-appendToFile <localsrc> ... <dst>]
        [-cat [-ignoreCrc] <src> ...]  //在终端显示文件内容
        [-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>] //复制到本地
        [-count [-q] [-h] <path> ...]  //显示目录中文件数量
        [-cp [-f] [-p | -p[topax]] <src> ... <dst>] //复制多个文件到目标目录
        [-createSnapshot <snapshotDir> [<snapshotName>]]
        [-deleteSnapshot <snapshotDir> <snapshotName>]
        [-df [-h] [<path> ...]]
        [-du [-s] [-h] <path> ...] //显示目录文件中所有文件内容
        [-expunge]
        [-find <path> ... <expression> ...]
        [-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] //复制文件到本地，可以忽略crc校验
        [-getfacl [-R] <path>]
        [-getfattr [-R] {-n name | -d} [-e en] <path>]
        [-getmerge [-nl] <src> <localdst>]   //将源目录中的所有文件排序合并到一个文件中
        [-help [cmd ...]]
        [-ls [-d] [-h] [-R] [<path> ...]] // 显示当前目录所有文件
        [-mkdir [-p] <path> ...] //创建文件夹
        [-moveFromLocal <localsrc> ... <dst>] //从本地中复制文件到hdfs
        [-moveToLocal <src> <localdst>]
        [-mv <src> ... <dst>]  //移动多个文件到目标目录
        [-put [-f] [-p] [-l] <localsrc> ... <dst>]  //本地文件复制到hdfs
        [-renameSnapshot <snapshotDir> <oldName> <newName>]
        [-rm [-f] [-r|-R] [-skipTrash] <src> ...] //删除文件
        [-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> ...] //在终端显示文件内容
        [-touchz <path> ...]  //创建一个空文件
        [-truncate [-w] <length> <path> ...]
        [-usage [cmd ...]]

Generic options supported are
-conf <configuration file>     specify an application configuration file
-D <property=value>            use value for given property
-fs <local|namenode:port>      specify a namenode
-jt <local|resourcemanager:port>    specify a ResourceManager
-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]