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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>du</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_001_014_491"> </a>NAME</h4><blockquote>du - estimate file space usage </blockquote><h4><a name = "tag_001_014_492"> </a>SYNOPSIS</h4><blockquote><pre><code>du <b>[</b>-a| -s<b>][</b>-kx<b>][</b>-r<b>][</b><i>file</i> ...<b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_493"> </a>DESCRIPTION</h4><blockquote>By default, the<i>du</i>utility writes to standard outputthe size of the file space allocatedto, and the size of the file space allocated to each subdirectoryof, the file hierarchy rooted in each of the specified files.The sizeof the file space allocated to a file of type directory is definedas the sum total of space allocated to all files in the file hierarchyrooted in the directory plus the space allocated to the directory itself.<p>When<i>du</i>cannot<i><a href="../xsh/stat.html">stat()</a></i>files or<i><a href="../xsh/stat.html">stat()</a></i>or read directories, it will reportan error condition and the final exit status will be affected.Files with multiple links will be counted and written for only one entry.The directory entry that is selected in the report is unspecified.By default, file sizes are written in 512-byte units,rounded up to the next 512-byte unit.</blockquote><h4><a name = "tag_001_014_494"> </a>OPTIONS</h4><blockquote>The<i>du</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> .<p>The following options are supported:<dl compact><dt><b>-a</b><dd>In addition to the default output, report the size of each filenot of type directory in the file hierarchy rooted in the specified file.Regardless of the presence of the<b>-a</b>option, non-directories given as<i>file</i>operands will always be listed.<dt><b>-k</b><dd>Write the files sizes in units of 1024 bytes,rather than the default 512-byte units.<dt><b>-r</b><dd>Generate messages aboutdirectories that cannot be read,files that cannot be opened, and so on.This is the default case.<dt><b>-s</b><dd>Instead of the default output, report only the total sum foreach of the specified files.<dt><b>-x</b><dd>When evaluating file sizes, evaluate only thosefiles that have the same device as the filespecified by the<i>file</i>operand.</dl></blockquote><h4><a name = "tag_001_014_495"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>file</i><dd>The pathname of a file whose size is to be written.If no<i>file</i>is specified,the current directory is used.</dl></blockquote><h4><a name = "tag_001_014_496"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_497"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_498"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>du</i>:<dl compact><dt><i>LANG</i><dd>Provide a default value for the internationalisation variablesthat are unset or null.If<i>LANG</i>is unset or null, the corresponding value from theimplementation-dependent default locale will be used.If any of the internationalisation variables contains an invalid setting, theutility will behave as if none of the variables had been defined.<dt><i>LC_ALL</i><dd>If set to a non-empty string value,override the values of all the other internationalisation variables.<dt><i>LC_CTYPE</i><dd>Determine thelocale for the interpretation of sequences of bytes of text data ascharacters (for example, single- as opposed to multi-byte charactersin arguments).<dt><i>LC_MESSAGES</i><dd>Determine the locale that should be used to affectthe format and contents of diagnosticmessages written to standard error.<dt><i>NLSPATH</i><dd>Determine the location of message cataloguesfor the processing of<i>LC_MESSAGES .</i></dl></blockquote><h4><a name = "tag_001_014_499"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_500"> </a>STDOUT</h4><blockquote>The output from<i>du</i>consists of the amount of the space allocatedto a file and the name of the file,in the following format:<p><code><tt>"%d %s\n"</tt>, <<i>size</i>>,<<i>pathname</i>></code></blockquote><h4><a name = "tag_001_014_501"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_502"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_503"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_504"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_505"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_506"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_507"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_508"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_509"> </a>SEE ALSO</h4><blockquote><i><a href="ls.html">ls</a></i>.<br></blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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