239 lines
7.4 KiB
HTML
239 lines
7.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<meta name="generator" content="HTML Tidy, see www.w3.org">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
|
<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
|
|
<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
|
|
<title>unalias</title>
|
|
</head>
|
|
<body bgcolor="white">
|
|
<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
|
|
</script>
|
|
|
|
<basefont size="3"> <a name="unalias"></a> <a name="tag_04_153"></a><!-- unalias -->
|
|
<!--header start-->
|
|
<center><font size="2">The Open Group Base Specifications Issue 6<br>
|
|
IEEE Std 1003.1-2001<br>
|
|
Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
|
|
|
|
<!--header end-->
|
|
<hr size="2" noshade>
|
|
<h4><a name="tag_04_153_01"></a>NAME</h4>
|
|
|
|
<blockquote>unalias - remove alias definitions</blockquote>
|
|
|
|
<h4><a name="tag_04_153_02"></a>SYNOPSIS</h4>
|
|
|
|
<blockquote class="synopsis">
|
|
<div class="box"><code><tt><sup>[<a href="javascript:open_code('UP')">UP</a>]</sup> <img src="../images/opt-start.gif" alt=
|
|
"[Option Start]" border="0"> unalias</tt> <i>alias-name</i><tt>...<br>
|
|
<br>
|
|
unalias -a <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
|
|
|
|
<tt><br>
|
|
</tt></blockquote>
|
|
|
|
<h4><a name="tag_04_153_03"></a>DESCRIPTION</h4>
|
|
|
|
<blockquote>
|
|
<p>The <i>unalias</i> utility shall remove the definition for each alias name specified. See <a href=
|
|
"xcu_chap02.html#tag_02_03_01"><i>Alias Substitution</i></a> . The aliases shall be removed from the current shell execution
|
|
environment; see <a href="xcu_chap02.html#tag_02_12"><i>Shell Execution Environment</i></a> .</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_04"></a>OPTIONS</h4>
|
|
|
|
<blockquote>
|
|
<p>The <i>unalias</i> utility shall conform to the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
|
|
"../basedefs/xbd_chap12.html#tag_12_02">Section 12.2, Utility Syntax Guidelines</a>.</p>
|
|
|
|
<p>The following option shall be supported:</p>
|
|
|
|
<dl compact>
|
|
<dt><b>-a</b></dt>
|
|
|
|
<dd>Remove all alias definitions from the current shell execution environment.</dd>
|
|
</dl>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_05"></a>OPERANDS</h4>
|
|
|
|
<blockquote>
|
|
<p>The following operand shall be supported:</p>
|
|
|
|
<dl compact>
|
|
<dt><i>alias-name</i></dt>
|
|
|
|
<dd>The name of an alias to be removed.</dd>
|
|
</dl>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_06"></a>STDIN</h4>
|
|
|
|
<blockquote>
|
|
<p>Not used.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_07"></a>INPUT FILES</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_08"></a>ENVIRONMENT VARIABLES</h4>
|
|
|
|
<blockquote>
|
|
<p>The following environment variables shall affect the execution of <i>unalias</i>:</p>
|
|
|
|
<dl compact>
|
|
<dt><i>LANG</i></dt>
|
|
|
|
<dd>Provide a default value for the internationalization variables that are unset or null. (See the Base Definitions volume of
|
|
IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap08.html#tag_08_02">Section 8.2, Internationalization Variables</a> for
|
|
the precedence of internationalization variables used to determine the values of locale categories.)</dd>
|
|
|
|
<dt><i>LC_ALL</i></dt>
|
|
|
|
<dd>If set to a non-empty string value, override the values of all the other internationalization variables.</dd>
|
|
|
|
<dt><i>LC_CTYPE</i></dt>
|
|
|
|
<dd>Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as
|
|
opposed to multi-byte characters in arguments).</dd>
|
|
|
|
<dt><i>LC_MESSAGES</i></dt>
|
|
|
|
<dd>Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard
|
|
error.</dd>
|
|
|
|
<dt><i>NLSPATH</i></dt>
|
|
|
|
<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
|
|
Determine the location of message catalogs for the processing of <i>LC_MESSAGES .</i> <img src="../images/opt-end.gif" alt=
|
|
"[Option End]" border="0"></dd>
|
|
</dl>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_09"></a>ASYNCHRONOUS EVENTS</h4>
|
|
|
|
<blockquote>
|
|
<p>Default.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_10"></a>STDOUT</h4>
|
|
|
|
<blockquote>
|
|
<p>Not used.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_11"></a>STDERR</h4>
|
|
|
|
<blockquote>
|
|
<p>The standard error shall be used only for diagnostic messages.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_12"></a>OUTPUT FILES</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_13"></a>EXTENDED DESCRIPTION</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_14"></a>EXIT STATUS</h4>
|
|
|
|
<blockquote>
|
|
<p>The following exit values shall be returned:</p>
|
|
|
|
<dl compact>
|
|
<dt> 0</dt>
|
|
|
|
<dd>Successful completion.</dd>
|
|
|
|
<dt>>0</dt>
|
|
|
|
<dd>One of the <i>alias-name</i> operands specified did not represent a valid alias definition, or an error occurred.</dd>
|
|
</dl>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_15"></a>CONSEQUENCES OF ERRORS</h4>
|
|
|
|
<blockquote>
|
|
<p>Default.</p>
|
|
</blockquote>
|
|
|
|
<hr>
|
|
<div class="box"><em>The following sections are informative.</em></div>
|
|
|
|
<h4><a name="tag_04_153_16"></a>APPLICATION USAGE</h4>
|
|
|
|
<blockquote>
|
|
<p>Since <i>unalias</i> affects the current shell execution environment, it is generally provided as a shell regular built-in.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_17"></a>EXAMPLES</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_18"></a>RATIONALE</h4>
|
|
|
|
<blockquote>
|
|
<p>The <i>unalias</i> description is based on that from historical KornShell implementations. Known differences exist between that
|
|
and the C shell. The KornShell version was adopted to be consistent with all the other KornShell features in this volume of
|
|
IEEE Std 1003.1-2001, such as command line editing.</p>
|
|
|
|
<p>The <b>-a</b> option is the equivalent of the <i>unalias</i> * form of the C shell and is provided to address security concerns
|
|
about unknown aliases entering the environment of a user (or application) through the allowable implementation-defined predefined
|
|
alias route or as a result of an <i>ENV</i> file. (Although <i>unalias</i> could be used to simplify the "secure" shell script
|
|
shown in the <a href="../utilities/command.html"><i>command</i></a> rationale, it does not obviate the need to quote all command
|
|
names. An initial call to <i>unalias</i> <b>-a</b> would have to be quoted in case there was an alias for <i>unalias</i>.)</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_19"></a>FUTURE DIRECTIONS</h4>
|
|
|
|
<blockquote>
|
|
<p>None.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_20"></a>SEE ALSO</h4>
|
|
|
|
<blockquote>
|
|
<p><a href="xcu_chap02.html#tag_02"><i>Shell Command Language</i></a> , <a href="alias.html"><i>alias</i></a></p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_21"></a>CHANGE HISTORY</h4>
|
|
|
|
<blockquote>
|
|
<p>First released in Issue 4.</p>
|
|
</blockquote>
|
|
|
|
<h4><a name="tag_04_153_22"></a>Issue 6</h4>
|
|
|
|
<blockquote>
|
|
<p>This utility is marked as part of the User Portability Utilities option.</p>
|
|
</blockquote>
|
|
|
|
<div class="box"><em>End of informative text.</em></div>
|
|
|
|
<hr>
|
|
<hr size="2" noshade>
|
|
<center><font size="2"><!--footer start-->
|
|
UNIX ® is a registered Trademark of The Open Group.<br>
|
|
POSIX ® is a registered Trademark of The IEEE.<br>
|
|
[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href=
|
|
"../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>
|
|
]</font></center>
|
|
|
|
<!--footer end-->
|
|
<hr size="2" noshade>
|
|
</body>
|
|
</html>
|
|
|