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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>ulimit</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="ulimit"></a> <a name="tag_04_151"></a><!-- ulimit --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_04_151_01"></a>NAME</h4><blockquote>ulimit - set or report file size limit</blockquote><h4><a name="tag_04_151_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> ulimit</tt> <b>[</b><tt>-f</tt><b>][</b><i>blocks</i><b>]</b><tt><img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div></blockquote><h4><a name="tag_04_151_03"></a>DESCRIPTION</h4><blockquote><p>The <i>ulimit</i> utility shall set or report the file-size writing limit imposed on files written by the shell and its childprocesses (files of any size may be read). Only a process with appropriate privileges can increase the limit.</p></blockquote><h4><a name="tag_04_151_04"></a>OPTIONS</h4><blockquote><p>The <i>ulimit</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p><p>The following option shall be supported:</p><dl compact><dt><b>-f</b></dt><dd>Set (or report, if no <i>blocks</i> operand is present), the file size limit in blocks. The <b>-f</b> option shall also be thedefault case.</dd></dl></blockquote><h4><a name="tag_04_151_05"></a>OPERANDS</h4><blockquote><p>The following operand shall be supported:</p><dl compact><dt><i>blocks</i></dt><dd>The number of 512-byte blocks to use as the new file size limit.</dd></dl></blockquote><h4><a name="tag_04_151_06"></a>STDIN</h4><blockquote><p>Not used.</p></blockquote><h4><a name="tag_04_151_07"></a>INPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_151_08"></a>ENVIRONMENT VARIABLES</h4><blockquote><p>The following environment variables shall affect the execution of <i>ulimit</i>:</p><dl compact><dt><i>LANG</i></dt><dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume ofIEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> forthe precedence of internationalization variables used to determine the values of locale categories.)</dd><dt><i>LC_ALL</i></dt><dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd><dt><i>LC_CTYPE</i></dt><dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte asopposed to multi-byte characters in arguments).</dd><dt><i>LC_MESSAGES</i></dt><dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standarderror.</dd><dt><i>NLSPATH</i></dt><dd>Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i></dd></dl></blockquote><h4><a name="tag_04_151_09"></a>ASYNCHRONOUS EVENTS</h4><blockquote><p>Default.</p></blockquote><h4><a name="tag_04_151_10"></a>STDOUT</h4><blockquote><p>The standard output shall be used when no <i>blocks</i> operand is present. If the current number of blocks is limited, thenumber of blocks in the current limit shall be written in the following format:</p><pre><tt>"%d\n", <</tt><i>number of 512-byte blocks</i><tt>></tt></pre><p>If there is no current limit on the number of blocks, in the POSIX locale the following format shall be used:</p><pre><tt>"unlimited\n"</tt></pre></blockquote><h4><a name="tag_04_151_11"></a>STDERR</h4><blockquote><p>The standard error shall be used only for diagnostic messages.</p></blockquote><h4><a name="tag_04_151_12"></a>OUTPUT FILES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_151_13"></a>EXTENDED DESCRIPTION</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_151_14"></a>EXIT STATUS</h4><blockquote><p>The following exit values shall be returned:</p><dl compact><dt> 0</dt><dd>Successful completion.</dd><dt>>0</dt><dd>A request for a higher limit was rejected or an error occurred.</dd></dl></blockquote><h4><a name="tag_04_151_15"></a>CONSEQUENCES OF ERRORS</h4><blockquote><p>Default.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_04_151_16"></a>APPLICATION USAGE</h4><blockquote><p>Since <i>ulimit</i> affects the current shell execution environment, it is always provided as a shell regular built-in. If it iscalled in a separate utility execution environment, such as one of the following:</p><pre><tt>nohup ulimit -f 10000env ulimit 10000</tt></pre><p>it does not affect the file size limit of the caller's environment.</p><p>Once a limit has been decreased by a process, it cannot be increased (unless appropriate privileges are involved), even back tothe original system limit.</p></blockquote><h4><a name="tag_04_151_17"></a>EXAMPLES</h4><blockquote><p>Set the file size limit to 51200 bytes:</p><pre><tt>ulimit -f 100</tt></pre></blockquote><h4><a name="tag_04_151_18"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_151_19"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_04_151_20"></a>SEE ALSO</h4><blockquote><p>The System Interfaces volume of IEEE Std 1003.1-2001, <a href="../functions/ulimit.html"><i>ulimit</i>()</a></p></blockquote><h4><a name="tag_04_151_21"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 2.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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