| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <head> |
| <META http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta content="Apache Forrest" name="Generator"> |
| <meta name="Forrest-version" content="0.8"> |
| <meta name="Forrest-skin-name" content="pelt"> |
| <title>Hadoop Shell命令</title> |
| <link type="text/css" href="skin/basic.css" rel="stylesheet"> |
| <link media="screen" type="text/css" href="skin/screen.css" rel="stylesheet"> |
| <link media="print" type="text/css" href="skin/print.css" rel="stylesheet"> |
| <link type="text/css" href="skin/profile.css" rel="stylesheet"> |
| <script src="skin/getBlank.js" language="javascript" type="text/javascript"></script><script src="skin/getMenu.js" language="javascript" type="text/javascript"></script><script src="skin/fontsize.js" language="javascript" type="text/javascript"></script> |
| <link rel="shortcut icon" href="images/favicon.ico"> |
| </head> |
| <body onload="init()"> |
| <script type="text/javascript">ndeSetTextSize();</script> |
| <div id="top"> |
| <!--+ |
| |breadtrail |
| +--> |
| <div class="breadtrail"> |
| <a href="http://www.apache.org/">Apache</a> > <a href="http://hadoop.apache.org/">Hadoop</a> > <a href="http://hadoop.apache.org/core/">Core</a><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script> |
| </div> |
| <!--+ |
| |header |
| +--> |
| <div class="header"> |
| <!--+ |
| |start group logo |
| +--> |
| <div class="grouplogo"> |
| <a href="http://hadoop.apache.org/"><img class="logoImage" alt="Hadoop" src="images/hadoop-logo.jpg" title="Apache Hadoop"></a> |
| </div> |
| <!--+ |
| |end group logo |
| +--> |
| <!--+ |
| |start Project Logo |
| +--> |
| <div class="projectlogo"> |
| <a href="http://hadoop.apache.org/core/"><img class="logoImage" alt="Hadoop" src="images/core-logo.gif" title="Scalable Computing Platform"></a> |
| </div> |
| <!--+ |
| |end Project Logo |
| +--> |
| <!--+ |
| |start Search |
| +--> |
| <div class="searchbox"> |
| <form action="http://www.google.com/search" method="get" class="roundtopsmall"> |
| <input value="hadoop.apache.org" name="sitesearch" type="hidden"><input onFocus="getBlank (this, 'Search the site with google');" size="25" name="q" id="query" type="text" value="Search the site with google"> |
| <input name="Search" value="Search" type="submit"> |
| </form> |
| </div> |
| <!--+ |
| |end search |
| +--> |
| <!--+ |
| |start Tabs |
| +--> |
| <ul id="tabs"> |
| <li> |
| <a class="unselected" href="http://hadoop.apache.org/core/">项目</a> |
| </li> |
| <li> |
| <a class="unselected" href="http://wiki.apache.org/hadoop">维基</a> |
| </li> |
| <li class="current"> |
| <a class="selected" href="index.html">Hadoop 0.18文档</a> |
| </li> |
| </ul> |
| <!--+ |
| |end Tabs |
| +--> |
| </div> |
| </div> |
| <div id="main"> |
| <div id="publishedStrip"> |
| <!--+ |
| |start Subtabs |
| +--> |
| <div id="level2tabs"></div> |
| <!--+ |
| |end Endtabs |
| +--> |
| <script type="text/javascript"><!-- |
| document.write("Last Published: " + document.lastModified); |
| // --></script> |
| </div> |
| <!--+ |
| |breadtrail |
| +--> |
| <div class="breadtrail"> |
| |
| |
| </div> |
| <!--+ |
| |start Menu, mainarea |
| +--> |
| <!--+ |
| |start Menu |
| +--> |
| <div id="menu"> |
| <div onclick="SwitchMenu('menu_selected_1.1', 'skin/')" id="menu_selected_1.1Title" class="menutitle" style="background-image: url('skin/images/chapter_open.gif');">文档</div> |
| <div id="menu_selected_1.1" class="selectedmenuitemgroup" style="display: block;"> |
| <div class="menuitem"> |
| <a href="index.html">概述</a> |
| </div> |
| <div class="menuitem"> |
| <a href="quickstart.html">快速入门</a> |
| </div> |
| <div class="menuitem"> |
| <a href="cluster_setup.html">集群搭建</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hdfs_design.html">HDFS构架设计</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hdfs_user_guide.html">HDFS使用指南</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hdfs_permissions_guide.html">HDFS权限指南</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hdfs_quota_admin_guide.html">HDFS配额管理指南</a> |
| </div> |
| <div class="menuitem"> |
| <a href="commands_manual.html">命令手册</a> |
| </div> |
| <div class="menupage"> |
| <div class="menupagetitle">FS Shell使用指南</div> |
| </div> |
| <div class="menuitem"> |
| <a href="distcp.html">DistCp使用指南</a> |
| </div> |
| <div class="menuitem"> |
| <a href="mapred_tutorial.html">Map-Reduce教程</a> |
| </div> |
| <div class="menuitem"> |
| <a href="native_libraries.html">Hadoop本地库</a> |
| </div> |
| <div class="menuitem"> |
| <a href="streaming.html">Streaming</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hadoop_archives.html">Hadoop Archives</a> |
| </div> |
| <div class="menuitem"> |
| <a href="hod.html">Hadoop On Demand</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://hadoop.apache.org/core/docs/r0.18.2/api/index.html">API参考</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://hadoop.apache.org/core/docs/r0.18.2/jdiff/changes.html">API Changes</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://wiki.apache.org/hadoop/">维基</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://wiki.apache.org/hadoop/FAQ">常见问题</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://hadoop.apache.org/core/mailing_lists.html">邮件列表</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://hadoop.apache.org/core/docs/r0.18.2/releasenotes.html">发行说明</a> |
| </div> |
| <div class="menuitem"> |
| <a href="http://hadoop.apache.org/core/docs/r0.18.2/changes.html">变更日志</a> |
| </div> |
| </div> |
| <div id="credit"></div> |
| <div id="roundbottom"> |
| <img style="display: none" class="corner" height="15" width="15" alt="" src="skin/images/rc-b-l-15-1body-2menu-3menu.png"></div> |
| <!--+ |
| |alternative credits |
| +--> |
| <div id="credit2"></div> |
| </div> |
| <!--+ |
| |end Menu |
| +--> |
| <!--+ |
| |start content |
| +--> |
| <div id="content"> |
| <div title="Portable Document Format" class="pdflink"> |
| <a class="dida" href="hdfs_shell.pdf"><img alt="PDF -icon" src="skin/images/pdfdoc.gif" class="skin"><br> |
| PDF</a> |
| </div> |
| <h1>Hadoop Shell命令</h1> |
| <div id="minitoc-area"> |
| <ul class="minitoc"> |
| <li> |
| <a href="#FS+Shell"> FS Shell </a> |
| <ul class="minitoc"> |
| <li> |
| <a href="#cat"> cat </a> |
| </li> |
| <li> |
| <a href="#chgrp"> chgrp </a> |
| </li> |
| <li> |
| <a href="#chmod"> chmod </a> |
| </li> |
| <li> |
| <a href="#chown"> chown </a> |
| </li> |
| <li> |
| <a href="#copyFromLocal">copyFromLocal</a> |
| </li> |
| <li> |
| <a href="#copyToLocal"> copyToLocal</a> |
| </li> |
| <li> |
| <a href="#cp"> cp </a> |
| </li> |
| <li> |
| <a href="#du">du</a> |
| </li> |
| <li> |
| <a href="#dus"> dus </a> |
| </li> |
| <li> |
| <a href="#expunge"> expunge </a> |
| </li> |
| <li> |
| <a href="#get"> get </a> |
| </li> |
| <li> |
| <a href="#getmerge"> getmerge </a> |
| </li> |
| <li> |
| <a href="#ls"> ls </a> |
| </li> |
| <li> |
| <a href="#lsr">lsr</a> |
| </li> |
| <li> |
| <a href="#mkdir"> mkdir </a> |
| </li> |
| <li> |
| <a href="#movefromLocal"> movefromLocal </a> |
| </li> |
| <li> |
| <a href="#mv"> mv </a> |
| </li> |
| <li> |
| <a href="#put"> put </a> |
| </li> |
| <li> |
| <a href="#rm"> rm </a> |
| </li> |
| <li> |
| <a href="#rmr"> rmr </a> |
| </li> |
| <li> |
| <a href="#setrep"> setrep </a> |
| </li> |
| <li> |
| <a href="#stat"> stat </a> |
| </li> |
| <li> |
| <a href="#tail"> tail </a> |
| </li> |
| <li> |
| <a href="#test"> test </a> |
| </li> |
| <li> |
| <a href="#text"> text </a> |
| </li> |
| <li> |
| <a href="#touchz"> touchz </a> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <!--DCCOMMENT:diff begin--> |
| |
| <a name="N1000F"></a><a name="FS+Shell"></a> |
| <h2 class="h3"> FS Shell </h2> |
| <div class="section"> |
| <p> |
| 调用文件系统(FS)Shell命令应使用 |
| <span class="codefrag">bin/hadoop fs <args></span>的形式。 |
| 所有的的FS shell命令使用URI路径作为参数。URI格式是<em>scheme://authority/path</em>。对HDFS文件系统,scheme是<em>hdfs</em>,对本地文件系统,scheme是<em>file</em>。其中scheme和authority参数都是可选的,如果未加指定,就会使用配置中指定的默认scheme。一个HDFS文件或目录比如<em>/parent/child</em>可以表示成<em>hdfs://namenode:namenodeport/parent/child</em>,或者更简单的<em>/parent/child</em>(假设你配置文件中的默认值是<em>namenode:namenodeport</em>)。大多数FS Shell命令的行为和对应的Unix Shell命令类似,不同之处会在下面介绍各命令使用详情时指出。出错信息会输出到<em>stderr</em>,其他信息输出到<em>stdout</em>。 |
| </p> |
| <a name="N10036"></a><a name="cat"></a> |
| <h3 class="h4"> cat </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -cat URI [URI …]</span> |
| |
| </p> |
| <p> |
| 将路径指定文件的内容输出到<em>stdout</em>。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -cat hdfs://host1:port1/file1 hdfs://host2:port2/file2 |
| </span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag">hadoop fs -cat file:///file3 /user/hadoop/file4 </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:<br> |
| <!--DCCOMMENT:diff end |
| note:"hadoop dfs" has been replaced by "hadoop fs" in this doc. |
| |
| @@ -39,11 +50,11 @@ |
| <p>Example:</p> |
| <ul> |
| <li> |
| - <code> hadoop dfs -cat hdfs://host1:port1/file1 hdfs://host2:port2/file2 |
| + <code> hadoop fs -cat hdfs://nn1.example.com/file1 hdfs://nn2.example.com/file2 |
| </code> |
| </li> |
| <li> |
| - <code>hadoop dfs -cat file:///file3 /user/hadoop/file4 </code> |
| + <code>hadoop fs -cat file:///file3 /user/hadoop/file4 </code> |
| </li> |
| </ul> |
| <p>Exit Code:<br/> |
| --> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| </p> |
| <a name="N10068"></a><a name="chgrp"></a> |
| <h3 class="h4"> chgrp </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -chgrp [-R] GROUP URI [URI …]</span> |
| Change group association of files. With <span class="codefrag">-R</span>, make the change recursively through the directory structure. The user must be the owner of files, or else a super-user. Additional information is in the <a href="hdfs_permissions_guide.html">Permissions User Guide</a>. |
| --> |
| </p> |
| <p> |
| 改变文件所属的组。使用<span class="codefrag">-R</span>将使改变在目录结构下递归进行。命令的使用者必须是文件的所有者或者超级用户。更多的信息请参见<a href="hdfs_permissions_guide.html">HDFS权限用户指南</a>。 |
| </p> |
| <a name="N10086"></a><a name="chmod"></a> |
| <h3 class="h4"> chmod </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -chmod [-R] <MODE[,MODE]... | OCTALMODE> URI [URI …]</span> |
| |
| </p> |
| <p> |
| 改变文件的权限。使用<span class="codefrag">-R</span>将使改变在目录结构下递归进行。命令的使用者必须是文件的所有者或者超级用户。更多的信息请参见<a href="hdfs_permissions_guide.html">HDFS权限用户指南</a>。 |
| </p> |
| <a name="N1009D"></a><a name="chown"></a> |
| <h3 class="h4"> chown </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -chown [-R] [OWNER][:[GROUP]] URI [URI ]</span> |
| |
| </p> |
| <p> |
| 改变文件的拥有者。使用<span class="codefrag">-R</span>将使改变在目录结构下递归进行。命令的使用者必须是超级用户。更多的信息请参见<a href="hdfs_permissions_guide.html">HDFS权限用户指南</a>。 |
| </p> |
| <a name="N100B4"></a><a name="copyFromLocal"></a> |
| <h3 class="h4">copyFromLocal</h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -copyFromLocal <localsrc> URI</span> |
| |
| </p> |
| <p>除了限定源路径是一个本地文件外,和<a href="#putlink"><strong>put</strong></a>命令相似。</p> |
| <a name="N100C9"></a><a name="copyToLocal"></a> |
| <h3 class="h4"> copyToLocal</h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -copyToLocal [-ignorecrc] [-crc] URI <localdst></span> |
| |
| </p> |
| <p>除了限定目标路径是一个本地文件外,和<a href="#getlink"><strong>get</strong></a>命令类似。</p> |
| <a name="N100DE"></a><a name="cp"></a> |
| <h3 class="h4"> cp </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -cp URI [URI …] <dest></span> |
| |
| </p> |
| <p> |
| 将文件从源路径复制到目标路径。这个命令允许有多个源路径,此时目标路径必须是一个目录。 |
| <br> |
| 示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -cp /user/hadoop/file1 /user/hadoop/file2</span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -cp /user/hadoop/file1 /user/hadoop/file2 /user/hadoop/dir </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N10108"></a><a name="du"></a> |
| <h3 class="h4">du</h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -du URI [URI …]</span> |
| |
| </p> |
| <p> |
| 显示目录中所有文件的大小,或者当只指定一个文件时,显示此文件的大小。<br> |
| 示例:<br> |
| <span class="codefrag">hadoop fs -du /user/hadoop/dir1 /user/hadoop/file1 hdfs://host:port/user/hadoop/dir1</span> |
| <br> |
| 返回值:<br> |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| <br> |
| </p> |
| <a name="N10123"></a><a name="dus"></a> |
| <h3 class="h4"> dus </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -dus <args></span> |
| |
| </p> |
| <p> |
| 显示文件的大小。 |
| </p> |
| <a name="N10133"></a><a name="expunge"></a> |
| <h3 class="h4"> expunge </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -expunge</span> |
| |
| </p> |
| <p>清空回收站。请参考<a href="hdfs_design.html">HDFS设计</a>文档以获取更多关于回收站特性的信息。 |
| </p> |
| <a name="N10147"></a><a name="get"></a> |
| <h3 class="h4"> get </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -get [-ignorecrc] [-crc] <src> <localdst></span> |
| |
| <br> |
| |
| </p> |
| <p> |
| 复制文件到本地文件系统。可用<span class="codefrag">-ignorecrc</span>选项复制CRC校验失败的文件。使用<span class="codefrag">-crc</span>选项复制文件以及CRC信息。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -get /user/hadoop/file localfile </span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -get hdfs://host:port/user/hadoop/file localfile</span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N1017B"></a><a name="getmerge"></a> |
| <h3 class="h4"> getmerge </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -getmerge <src> <localdst> [addnl]</span> |
| |
| </p> |
| <p> |
| 接受一个源目录和一个目标文件作为输入,并且将源目录中所有的文件连接成本地目标文件。<span class="codefrag">addnl</span>是可选的,用于指定在每个文件结尾添加一个换行符。 |
| </p> |
| <a name="N1018E"></a><a name="ls"></a> |
| <h3 class="h4"> ls </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -ls <args></span> |
| |
| </p> |
| <p>如果是文件,则按照如下格式返回文件信息:<br> |
| <span class="codefrag">文件名 <副本数> 文件大小 修改日期 修改时间 权限 用户ID 组ID</span> |
| <br> |
| 如果是目录,则返回它直接子文件的一个列表,就像在Unix中一样。目录返回列表的信息如下:<br> |
| <span class="codefrag">目录名 <dir> 修改日期 修改时间 权限 用户ID 组ID</span> |
| <br> |
| 示例:<br> |
| <span class="codefrag">hadoop fs -ls /user/hadoop/file1 /user/hadoop/file2 hdfs://host:port/user/hadoop/dir1 /nonexistentfile</span> |
| <br> |
| 返回值:<br> |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| <br> |
| </p> |
| <a name="N101B1"></a><a name="lsr"></a> |
| <h3 class="h4">lsr</h3> |
| <p> |
| <span class="codefrag">使用方法:hadoop fs -lsr <args></span> |
| <br> |
| |
| <span class="codefrag">ls</span>命令的递归版本。类似于Unix中的<span class="codefrag">ls -R</span>。 |
| </p> |
| <a name="N101C4"></a><a name="mkdir"></a> |
| <h3 class="h4"> mkdir </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -mkdir <paths></span> |
| |
| <br> |
| |
| </p> |
| <p>接受路径指定的uri作为参数,创建这些目录。其行为类似于Unix的mkdir -p,它会创建路径中的各级父目录。</p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag">hadoop fs -mkdir /user/hadoop/dir1 /user/hadoop/dir2 </span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag">hadoop fs -mkdir hdfs://host1:port1/user/hadoop/dir hdfs://host2:port2/user/hadoop/dir |
| </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag">成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N101F1"></a><a name="movefromLocal"></a> |
| <h3 class="h4"> movefromLocal </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:dfs -moveFromLocal <src> <dst></span> |
| |
| </p> |
| <p>输出一个”not implemented“信息。 |
| </p> |
| <a name="N10201"></a><a name="mv"></a> |
| <h3 class="h4"> mv </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -mv URI [URI …] <dest></span> |
| |
| </p> |
| <p> |
| 将文件从源路径移动到目标路径。这个命令允许有多个源路径,此时目标路径必须是一个目录。不允许在不同的文件系统间移动文件。 |
| <br> |
| 示例: |
| </p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -mv /user/hadoop/file1 /user/hadoop/file2</span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -mv hdfs://host:port/file1 hdfs://host:port/file2 hdfs://host:port/file3 hdfs://host:port/dir1</span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N1022B"></a><a name="put"></a> |
| <h3 class="h4"> put </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -put <localsrc> ... <dst></span> |
| |
| </p> |
| <p>从本地文件系统中复制单个或多个源路径到目标文件系统。也支持从标准输入中读取输入写入目标文件系统。<br> |
| |
| </p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -put localfile /user/hadoop/hadoopfile</span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -put localfile1 localfile2 /user/hadoop/hadoopdir</span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -put localfile hdfs://host:port/hadoop/hadoopfile</span> |
| |
| </li> |
| |
| <li> |
| <span class="codefrag">hadoop fs -put - hdfs://host:port/hadoop/hadoopfile</span> |
| <br>从标准输入中读取输入。</li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N10262"></a><a name="rm"></a> |
| <h3 class="h4"> rm </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -rm URI [URI …] </span> |
| |
| </p> |
| <p> |
| 删除指定的文件。只删除非空目录和文件。请参考rmr命令了解递归删除。<br> |
| 示例: |
| </p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -rm hdfs://host:port/file /user/hadoop/emptydir </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N10286"></a><a name="rmr"></a> |
| <h3 class="h4"> rmr </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -rmr URI [URI …]</span> |
| |
| </p> |
| <p>delete的递归版本。<br> |
| 示例: |
| </p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -rmr /user/hadoop/dir </span> |
| |
| </li> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -rmr hdfs://host:port/user/hadoop/dir </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N102B0"></a><a name="setrep"></a> |
| <h3 class="h4"> setrep </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -setrep [-R] <path></span> |
| |
| </p> |
| <p> |
| 改变一个文件的副本系数。-R选项用于递归改变目录下所有文件的副本系数。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -setrep -w 3 -R /user/hadoop/dir1 </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:</p> |
| <p> |
| |
| <span class="codefrag">成功返回0,失败返回-1。</span> |
| |
| </p> |
| <a name="N102D5"></a><a name="stat"></a> |
| <h3 class="h4"> stat </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -stat URI [URI …]</span> |
| |
| </p> |
| <p> |
| 返回指定路径的统计信息。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -stat path </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:<br> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| </p> |
| <a name="N102F8"></a><a name="tail"></a> |
| <h3 class="h4"> tail </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -tail [-f] URI </span> |
| |
| </p> |
| <p> |
| 将文件尾部1K字节的内容输出到stdout。支持-f选项,行为和Unix中一致。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -tail pathname </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:<br> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| </p> |
| <a name="N1031B"></a><a name="test"></a> |
| <h3 class="h4"> test </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -test -[ezd] URI</span> |
| |
| </p> |
| <p> |
| 选项:<br> |
| -e 检查文件是否存在。如果存在则返回0。<br> |
| -z 检查文件是否是0字节。如果是则返回0。 <br> |
| -d 如果路径是个目录,则返回1,否则返回0。<br> |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop fs -test -e filename </span> |
| |
| </li> |
| |
| </ul> |
| <a name="N1033E"></a><a name="text"></a> |
| <h3 class="h4"> text </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -text <src></span> |
| |
| <br> |
| |
| </p> |
| <p> |
| 将源文件输出为文本格式。允许的格式是zip和TextRecordInputStream。 |
| </p> |
| <a name="N10350"></a><a name="touchz"></a> |
| <h3 class="h4"> touchz </h3> |
| <p> |
| |
| <span class="codefrag">使用方法:hadoop fs -touchz URI [URI …]</span> |
| |
| <br> |
| |
| </p> |
| <p> |
| 创建一个0字节的空文件。 |
| </p> |
| <p>示例:</p> |
| <ul> |
| |
| <li> |
| |
| <span class="codefrag"> hadoop -touchz pathname </span> |
| |
| </li> |
| |
| </ul> |
| <p>返回值:<br> |
| |
| <span class="codefrag"> 成功返回0,失败返回-1。</span> |
| </p> |
| </div> |
| |
| </div> |
| <!--+ |
| |end content |
| +--> |
| <div class="clearboth"> </div> |
| </div> |
| <div id="footer"> |
| <!--+ |
| |start bottomstrip |
| +--> |
| <div class="lastmodified"> |
| <script type="text/javascript"><!-- |
| document.write("Last Published: " + document.lastModified); |
| // --></script> |
| </div> |
| <div class="copyright"> |
| Copyright © |
| 2007 <a href="http://www.apache.org/licenses/">The Apache Software Foundation.</a> |
| </div> |
| <!--+ |
| |end bottomstrip |
| +--> |
| </div> |
| </body> |
| </html> |