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| <h3 class="section">9.3 Editing Source Files</h3> |
| |
| <p><a name="index-editing-source-files-446"></a> |
| <a name="index-edit-447"></a><a name="index-e-_0040r_007b_0028_0040code_007bedit_007d_0029_007d-448"></a>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: |
| |
| <dl> |
| <dt><code>edit </code><var>location</var><dd>Edit the source file specified by <code>location</code>. Editing starts at |
| that <var>location</var>, e.g., at the specified source line of the |
| specified file. See <a href="Specify-Location.html#Specify-Location">Specify Location</a>, for all the possible forms |
| of the <var>location</var> argument; here are the forms of the <code>edit</code> |
| command most commonly used: |
| |
| <dl> |
| <dt><code>edit </code><var>number</var><dd>Edit the current source file with <var>number</var> as the active line number. |
| |
| <br><dt><code>edit </code><var>function</var><dd>Edit the file containing <var>function</var> at the beginning of its definition. |
| </dl> |
| |
| </dl> |
| |
| <h4 class="subsection">9.3.1 Choosing your Editor</h4> |
| |
| <p>You can customize <span class="sc">gdb</span> to use any editor you want |
| <a rel="footnote" href="#fn-1" name="fnd-1"><sup>1</sup></a>. |
| By default, it is <samp><span class="file">/bin/ex</span></samp>, but you can change this |
| by setting the environment variable <code>EDITOR</code> before using |
| <span class="sc">gdb</span>. For example, to configure <span class="sc">gdb</span> to use the |
| <code>vi</code> editor, you could use these commands with the <code>sh</code> shell: |
| <pre class="smallexample"> EDITOR=/usr/bin/vi |
| export EDITOR |
| gdb ... |
| </pre> |
| <p>or in the <code>csh</code> shell, |
| <pre class="smallexample"> setenv EDITOR /usr/bin/vi |
| gdb ... |
| </pre> |
| <div class="footnote"> |
| <hr> |
| <h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> |
| The only restriction is that your editor (say <code>ex</code>), recognizes the |
| following command-line syntax: |
| <pre class="smallexample"> ex +<var>number</var> file |
| </pre> |
| <p>The optional numeric value +<var>number</var> specifies the number of the line in |
| the file where to start editing.</p> |
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