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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>mesg</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_1403"> </a>NAME</h4><blockquote>mesg - permit or deny messages</blockquote><h4><a name = "tag_001_014_1404"> </a>SYNOPSIS</h4><blockquote><pre><code>mesg <b>[</b>y|n<b>]</b></code></pre></blockquote><h4><a name = "tag_001_014_1405"> </a>DESCRIPTION</h4><blockquote>The<i>mesg</i>utility will control whether other users are allowedto send messages via<i><a href="write.html">write</a></i>,<i><a href="talk.html">talk</a></i>or other utilities to a terminal device.The terminal device affectedis determined by searching for the first terminal inthe sequence of devices associated withstandard input, standard output andstandard error, respectively.With no arguments,<i>mesg</i>reports the current state without changing it.Processes with appropriate privileges may be able tosend messages to the terminal independent of the current state.</blockquote><h4><a name = "tag_001_014_1406"> </a>OPTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1407"> </a>OPERANDS</h4><blockquote>The following operands are supportedin the POSIX locale:<dl compact><dt><b>y</b><dd>Grant permission to other usersto send messages to the terminal device.<dt><b>n</b><dd>Deny permission to other usersto send messages to the terminal device.</dl></blockquote><h4><a name = "tag_001_014_1408"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_1409"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1410"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>mesg</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 (by<i>mesg</i>)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_1411"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1412"> </a>STDOUT</h4><blockquote>If no operand is specified,<i>mesg</i>displays the current terminal state in an unspecified format.</blockquote><h4><a name = "tag_001_014_1413"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_1414"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1415"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1416"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Receiving messages is allowed.<dt>1<dd>Receiving messages is not allowed.<dt>>1<dd>An error occurred.</dl></blockquote><h4><a name = "tag_001_014_1417"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_1418"> </a>APPLICATION USAGE</h4><blockquote>The mechanism by which the message status of the terminalis changed is unspecified.Therefore, unspecified actions may cause the statusof the terminal to change after<i>mesg</i>has successfully completed.These actions may include, but are not limited to:another invocation of the<i>mesg</i>utility;login procedures;invocation of the<i><a href="stty.html">stty</a></i>utility;invocation of the<i><a href="chmod.html">chmod</a></i>utility or<i><a href="../xsh/chmod.html">chmod()</a></i>function;and so on.</blockquote><h4><a name = "tag_001_014_1419"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1420"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_1421"> </a>SEE ALSO</h4><blockquote><i><a href="talk.html">talk</a></i>,<i><a href="write.html">write</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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