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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>ulimit</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_2429"> </a>NAME</h4><blockquote>ulimit - set or report file size limit</blockquote><h4><a name = "tag_001_014_2430"> </a>SYNOPSIS</h4><blockquote><pre><code>ulimit <b>[</b>-f<b>][</b><i>blocks</i><b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_2431"> </a>DESCRIPTION</h4><blockquote>The<i>ulimit</i>utility sets or reports the file-size writing limitimposed on files written by the shell and itschild processes (files of any size may be read).Only a process with appropriate privileges can increase the limit.</blockquote><h4><a name = "tag_001_014_2432"> </a>OPTIONS</h4><blockquote>The<i>ulimit</i>utility supports the <b>XBD</b> specification, <a href="../xbd/utilconv.html#usg"><b>Utility Syntax Guidelines</b> </a> .<p>The following option is supported:<dl compact><dt><b>-f</b><dd>Set (or report, if no<i>blocks</i>operand is present), the file size limit in blocks.The<b>-f</b>option is also the default case.</dl></blockquote><h4><a name = "tag_001_014_2433"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>blocks</i><dd>The number of 512-byte blocks to use as the newfile size limit.</dl></blockquote><h4><a name = "tag_001_014_2434"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2435"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2436"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>ulimit</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_2437"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.<br></blockquote><h4><a name = "tag_001_014_2438"> </a>STDOUT</h4><blockquote>The standard output is used when no<i>blocks</i>operand is present.If the current number of blocks is limited,the number of blocks in the current limit is writtenin the following format:<p><code><tt>"%d\n"</tt>, <<i>number of 512-byte blocks</i>></code><p>If there is no current limit on the number of blocks, in the POSIX localethe following format is used:<pre><code>"unlimited\n"</code></pre></blockquote><h4><a name = "tag_001_014_2439"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2440"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2441"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2442"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>A request for a higher limit was rejected oran error occurred.</dl></blockquote><h4><a name = "tag_001_014_2443"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2444"> </a>APPLICATION USAGE</h4><blockquote>Since<i>ulimit</i>affects the current shell execution environment,it is always provided as a shell regular built-in.If it is called in separate utility execution environment,such as one of the following:<pre><code>nohup ulimit -f 10000env ulimit 10000</code></pre>it will not affect the file size limit of the caller's environment.<p>Once a limit has been decreased by a process, it cannot beincreased (unless appropriate privileges are involved),even back to the original system limit.</blockquote><h4><a name = "tag_001_014_2445"> </a>EXAMPLES</h4><blockquote>Set the file size limit to 51,200 bytes:<pre><code>ulimit -f 100</code></pre></blockquote><h4><a name = "tag_001_014_2446"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2447"> </a>SEE ALSO</h4><blockquote>The <b>XSH</b> specification description of<i><a href="../xsh/ulimit.html">ulimit()</a></i>.</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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