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