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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>sleep</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_2011"> </a>NAME</h4><blockquote>sleep - suspend execution for an interval</blockquote><h4><a name = "tag_001_014_2012"> </a>SYNOPSIS</h4><blockquote><pre><code>sleep <i>time</i></code></pre></blockquote><h4><a name = "tag_001_014_2013"> </a>DESCRIPTION</h4><blockquote>The<i>sleep</i>utility will suspend execution forat least the integral number of seconds specified by the<i>time</i>operand.</blockquote><h4><a name = "tag_001_014_2014"> </a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2015"> </a>OPERANDS</h4><blockquote>The following operands are supported:<dl compact><dt><i>time</i><dd>A non-negative decimal integer specifyingthe number of seconds for which to suspend execution.</dl></blockquote><h4><a name = "tag_001_014_2016"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2017"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2018"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>sleep</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_2019"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>If the<i>sleep</i>utility receives a SIGALRM signal, one of the followingactions will be taken:<ol><p><li>Terminate normally with a zero exit status.<p><li>Effectively ignore the signal.<p><li>Provide the default behaviour for signals described in theASYNCHRONOUS EVENTS section of<a href="utildes.html">Utility Description Defaults</a><xref href=utildes></xref>.This could include terminating with a non-zero exit status.<p></ol><p>The<i>sleep</i>utility will take the standard action for all other signals.</blockquote><h4><a name = "tag_001_014_2020"> </a>STDOUT</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2021"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2022"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2023"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2024"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>The execution was successfully suspended for at least<i>time</i>seconds, or a SIGALRM signal was received (seethe ASYNCHRONOUS EVENTS section).<dt>>0<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_2025"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2026"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2027"> </a>EXAMPLES</h4><blockquote>The<i>sleep</i>utility can be used to execute a commandafter a certain amount of time, as in:<pre><code>(sleep 105; <i>command</i>) &</code></pre><p>or to execute a command every so often, as in:<pre><code>while truedo <i>command</i> sleep 37done</code></pre></blockquote><h4><a name = "tag_001_014_2028"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2029"> </a>SEE ALSO</h4><blockquote><i><a href="wait.html">wait</a></i>,the <b>XSH</b> specification description of<i><a href="../xsh/alarm.html">alarm()</a></i>,<i><a href="../xsh/sleep.html">sleep()</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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