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+<head>
+<title>Debugging with GDB: Edit</title>
+
+<meta name="description" content="Debugging with GDB: Edit">
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+<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
+<a name="Edit"></a>
+<div class="header">
+<p>
+Next: <a href="Search.html#Search" accesskey="n" rel="next">Search</a>, Previous: <a href="Location-Specifications.html#Location-Specifications" accesskey="p" rel="previous">Location Specifications</a>, Up: <a href="Source.html#Source" accesskey="u" rel="up">Source</a> &nbsp; [<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>
+</div>
+<hr>
+<a name="Editing-Source-Files"></a>
+<h3 class="section">9.3 Editing Source Files</h3>
+<a name="index-editing-source-files"></a>
+
+<a name="index-edit"></a>
+<a name="index-e-_0028edit_0029"></a>
+<p>To edit the lines in a source file, use the <code>edit</code> command.
+The editing program of your choice
+is invoked with the current line set to
+the active line in the program.
+Alternatively, there are several ways to specify what part of the file you
+want to print if you want to see other parts of the program:
+</p>
+<dl compact="compact">
+<dt><code>edit <var>locspec</var></code></dt>
+<dd><p>Edit the source file of the code location that results from resolving
+<code>locspec</code>. Editing starts at the source file and source line
+<code>locspec</code> resolves to.
+See <a href="Location-Specifications.html#Location-Specifications">Location Specifications</a>, for all the possible forms of the
+<var>locspec</var> argument.
+</p>
+<p>If <code>locspec</code> resolves to more than one source line in your
+program, then the command prints the list of resolved source lines and
+does not proceed with the editing.
+</p>
+<p>Here are the forms of the <code>edit</code> command most commonly used:
+</p>
+<dl compact="compact">
+<dt><code>edit <var>number</var></code></dt>
+<dd><p>Edit the current source file with <var>number</var> as the active line number.
+</p>
+</dd>
+<dt><code>edit <var>function</var></code></dt>
+<dd><p>Edit the file containing <var>function</var> at the beginning of its definition.
+</p></dd>
+</dl>
+
+</dd>
+</dl>
+
+<a name="Choosing-your-Editor"></a>
+<h4 class="subsection">9.3.1 Choosing your Editor</h4>
+<p>You can customize <small>GDB</small> to use any editor you want
+<a name="DOCF10" href="#FOOT10"><sup>10</sup></a>.
+By default, it is <samp>/bin/ex</samp>, but you can change this
+by setting the environment variable <code>EDITOR</code> before using
+<small>GDB</small>. For example, to configure <small>GDB</small> to use the
+<code>vi</code> editor, you could use these commands with the <code>sh</code> shell:
+</p><div class="smallexample">
+<pre class="smallexample">EDITOR=/usr/bin/vi
+export EDITOR
+gdb &hellip;
+</pre></div>
+<p>or in the <code>csh</code> shell,
+</p><div class="smallexample">
+<pre class="smallexample">setenv EDITOR /usr/bin/vi
+gdb &hellip;
+</pre></div>
+
+<div class="footnote">
+<hr>
+<h4 class="footnotes-heading">Footnotes</h4>
+
+<h3><a name="FOOT10" href="#DOCF10">(10)</a></h3>
+<p>The only restriction is that your editor (say <code>ex</code>), recognizes the
+following command-line syntax:
+</p><div class="smallexample">
+<pre class="smallexample">ex +<var>number</var> file
+</pre></div>
+<p>The optional numeric value +<var>number</var> specifies the number of the line in
+the file where to start editing.</p>
+</div>
+<hr>
+<div class="header">
+<p>
+Next: <a href="Search.html#Search" accesskey="n" rel="next">Search</a>, Previous: <a href="Location-Specifications.html#Location-Specifications" accesskey="p" rel="previous">Location Specifications</a>, Up: <a href="Source.html#Source" accesskey="u" rel="up">Source</a> &nbsp; [<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>
+</div>
+
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+</html>