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168 lines
7.4 KiB
HTML
168 lines
7.4 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Aliases (Debugging with GDB)</title>
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<meta name="description" content="Aliases (Debugging with GDB)">
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<meta name="keywords" content="Aliases (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Extending-GDB.html#Extending-GDB" rel="up" title="Extending GDB">
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<link href="Interpreters.html#Interpreters" rel="next" title="Interpreters">
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<link href="Multiple-Extension-Languages.html#Multiple-Extension-Languages" rel="prev" title="Multiple Extension Languages">
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<style type="text/css">
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</style>
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</head>
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<body lang="en">
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<a name="Aliases"></a>
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<div class="header">
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<p>
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Previous: <a href="Multiple-Extension-Languages.html#Multiple-Extension-Languages" accesskey="p" rel="prev">Multiple Extension Languages</a>, Up: <a href="Extending-GDB.html#Extending-GDB" accesskey="u" rel="up">Extending GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Creating-new-spellings-of-existing-commands"></a>
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<h3 class="section">23.6 Creating new spellings of existing commands</h3>
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<a name="index-aliases-for-commands"></a>
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<p>It is often useful to define alternate spellings of existing commands.
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For example, if a new <small>GDB</small> command defined in Python has
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a long name to type, it is handy to have an abbreviated version of it
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that involves less typing.
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</p>
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<p><small>GDB</small> itself uses aliases. For example ‘<samp>s</samp>’ is an alias
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of the ‘<samp>step</samp>’ command even though it is otherwise an ambiguous
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abbreviation of other commands like ‘<samp>set</samp>’ and ‘<samp>show</samp>’.
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</p>
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<p>Aliases are also used to provide shortened or more common versions
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of multi-word commands. For example, <small>GDB</small> provides the
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‘<samp>tty</samp>’ alias of the ‘<samp>set inferior-tty</samp>’ command.
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</p>
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<p>You can define a new alias with the ‘<samp>alias</samp>’ command.
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</p>
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<dl compact="compact">
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<dd>
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<a name="index-alias"></a>
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</dd>
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<dt><code>alias [-a] [--] <var>ALIAS</var> = <var>COMMAND</var></code></dt>
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</dl>
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<p><var>ALIAS</var> specifies the name of the new alias.
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Each word of <var>ALIAS</var> must consist of letters, numbers, dashes and
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underscores.
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</p>
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<p><var>COMMAND</var> specifies the name of an existing command
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that is being aliased.
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</p>
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<p>The ‘<samp>-a</samp>’ option specifies that the new alias is an abbreviation
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of the command. Abbreviations are not shown in command
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lists displayed by the ‘<samp>help</samp>’ command.
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</p>
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<p>The ‘<samp>--</samp>’ option specifies the end of options,
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and is useful when <var>ALIAS</var> begins with a dash.
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</p>
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<p>Here is a simple example showing how to make an abbreviation
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of a command so that there is less to type.
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Suppose you were tired of typing ‘<samp>disas</samp>’, the current
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shortest unambiguous abbreviation of the ‘<samp>disassemble</samp>’ command
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and you wanted an even shorter version named ‘<samp>di</samp>’.
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The following will accomplish this.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) alias -a di = disas
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</pre></div>
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<p>Note that aliases are different from user-defined commands.
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With a user-defined command, you also need to write documentation
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for it with the ‘<samp>document</samp>’ command.
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An alias automatically picks up the documentation of the existing command.
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</p>
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<p>Here is an example where we make ‘<samp>elms</samp>’ an abbreviation of
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‘<samp>elements</samp>’ in the ‘<samp>set print elements</samp>’ command.
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This is to show that you can make an abbreviation of any part
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of a command.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) alias -a set print elms = set print elements
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(gdb) alias -a show print elms = show print elements
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(gdb) set p elms 20
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(gdb) show p elms
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Limit on string chars or array elements to print is 200.
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</pre></div>
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<p>Note that if you are defining an alias of a ‘<samp>set</samp>’ command,
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and you want to have an alias for the corresponding ‘<samp>show</samp>’
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command, then you need to define the latter separately.
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</p>
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<p>Unambiguously abbreviated commands are allowed in <var>COMMAND</var> and
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<var>ALIAS</var>, just as they are normally.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) alias -a set pr elms = set p ele
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</pre></div>
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<p>Finally, here is an example showing the creation of a one word
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alias for a more complex command.
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This creates alias ‘<samp>spe</samp>’ of the command ‘<samp>set print elements</samp>’.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) alias spe = set print elements
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(gdb) spe 20
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Previous: <a href="Multiple-Extension-Languages.html#Multiple-Extension-Languages" accesskey="p" rel="prev">Multiple Extension Languages</a>, Up: <a href="Extending-GDB.html#Extending-GDB" accesskey="u" rel="up">Extending GDB</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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