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= 實作二： HDFS 指令操作練習  =

 == 前言 ==

 * 此部份接續實做一
    
 == Content 1. 基本操作 ==
 === 1.1 瀏覽你HDFS目錄  === 

{{{
/opt/hadoop$ bin/hadoop fs -ls
}}}

 === 1.2 上傳資料到HDFS目錄 === 
 * 上傳

{{{
/opt/hadoop$ bin/hadoop fs -put conf input
}}} 

 * 檢查

{{{
/opt/hadoop$ bin/hadoop fs -ls
/opt/hadoop$ bin/hadoop fs -ls input
}}}
 
 === 1.3 下載HDFS的資料到本地目錄 === 

 * 下載

{{{
/opt/hadoop$ bin/hadoop fs -get input fromHDFS
}}} 

 * 檢查

{{{
/opt/hadoop$ ls -al | grep fromHDFS
/opt/hadoop$ ls -al fromHDFS
}}}  

 === 1.4 刪除檔案 ===

{{{
/opt/hadoop$ bin/hadoop fs -ls input
/opt/hadoop$ bin/hadoop fs -rm input/masters
}}} 

 === 1.5 直接看檔案 ===

{{{
/opt/hadoop$ bin/hadoop fs -ls input
/opt/hadoop$ bin/hadoop fs -cat input/slaves
}}} 

 === 1.6 更多指令操作 ===

{{{
hadooper@vPro:/opt/hadoop$ bin/hadoop fs 

Usage: java FsShell
           [-ls <path>]
           [-lsr <path>]
           [-du <path>]
           [-dus <path>]
           [-count[-q] <path>]
           [-mv <src> <dst>]
           [-cp <src> <dst>]
           [-rm <path>]
           [-rmr <path>]
           [-expunge]
           [-put <localsrc> ... <dst>]
           [-copyFromLocal <localsrc> ... <dst>]
           [-moveFromLocal <localsrc> ... <dst>]
           [-get [-ignoreCrc] [-crc] <src> <localdst>]
           [-getmerge <src> <localdst> [addnl]]
           [-cat <src>]
           [-text <src>]
           [-copyToLocal [-ignoreCrc] [-crc] <src> <localdst>]
           [-moveToLocal [-crc] <src> <localdst>]
           [-mkdir <path>]
           [-setrep [-R] [-w] <rep> <path/file>]
           [-touchz <path>]
           [-test -[ezd] <path>]
           [-stat [format] <path>]
           [-tail [-f] <file>]
           [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
           [-chown [-R] [OWNER][:[GROUP]] PATH...]
           [-chgrp [-R] GROUP PATH...]
           [-help [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|jobtracker:port>    specify a job tracker
-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]

}}}  
 
  
 
 == Content 2. 使用網頁Gui瀏覽資訊 ==
 
 * [http://localhost:50030 Map/Reduce Administration]
 * [http://localhost:50070 NameNode ]