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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>unalias</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_2467"> </a>NAME</h4><blockquote>unalias - remove alias definitions</blockquote><h4><a name = "tag_001_014_2468"> </a>SYNOPSIS</h4><blockquote><pre><code>unalias <i>alias-name</i>...unalias -a</code></pre></blockquote><h4><a name = "tag_001_014_2469"> </a>DESCRIPTION</h4><blockquote>The<i>unalias</i>utility removes the definition for each alias name specified.See<xref href=alsub><a href="chap2.html#tag_001_003_001">Alias Substitution</a></xref>.The aliases are removedfrom the current shell execution environment;see<xref href=shexenv><a href="chap2.html#tag_001_012">Shell Execution Environment</a></xref>.</blockquote><h4><a name = "tag_001_014_2470"> </a>OPTIONS</h4><blockquote>The<i>unalias</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>-a</b><dd>Remove all alias definitions from the current shell execution environment.</dl></blockquote><h4><a name = "tag_001_014_2471"> </a>OPERANDS</h4><blockquote>The following operand is supported:<dl compact><dt><i>alias-name</i><dd>The name of an alias to be removed.</dl></blockquote><h4><a name = "tag_001_014_2472"> </a>STDIN</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2473"> </a>INPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2474"> </a>ENVIRONMENT VARIABLES</h4><blockquote>The following environment variables affect the execution of<i>unalias</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_2475"> </a>ASYNCHRONOUS EVENTS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2476"> </a>STDOUT</h4><blockquote>Not used.</blockquote><h4><a name = "tag_001_014_2477"> </a>STDERR</h4><blockquote>Used only for diagnostic messages.</blockquote><h4><a name = "tag_001_014_2478"> </a>OUTPUT FILES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2479"> </a>EXTENDED DESCRIPTION</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2480"> </a>EXIT STATUS</h4><blockquote>The following exit values are returned:<dl compact><dt>0<dd>Successful completion.<dt>>0<dd>One of the<i>alias-name</i>operands specified did not represent a valid alias definition, oran error occurred.</dl></blockquote><h4><a name = "tag_001_014_2481"> </a>CONSEQUENCES OF ERRORS</h4><blockquote>Default.</blockquote><h4><a name = "tag_001_014_2482"> </a>APPLICATION USAGE</h4><blockquote>Since<i>unalias</i>affects the current shell execution environment,it is generally provided as a shell regular built-in.</blockquote><h4><a name = "tag_001_014_2483"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2484"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_001_014_2485"> </a>SEE ALSO</h4><blockquote><i><a href="alias.html">alias</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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