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| <h3 class="section">9.1 Printing Source Lines</h3> |
| |
| <p><a name="index-list-555"></a><a name="index-l-_0040r_007b_0028_0040code_007blist_007d_0029_007d-556"></a>To print lines from a source file, use the <code>list</code> command |
| (abbreviated <code>l</code>). By default, ten lines are printed. |
| There are several ways to specify what part of the file you want to |
| print; see <a href="Specify-Location.html#Specify-Location">Specify Location</a>, for the full list. |
| |
| <p>Here are the forms of the <code>list</code> command most commonly used: |
| |
| <dl> |
| <dt><code>list </code><var>linenum</var><dd>Print lines centered around line number <var>linenum</var> in the |
| current source file. |
| |
| <br><dt><code>list </code><var>function</var><dd>Print lines centered around the beginning of function |
| <var>function</var>. |
| |
| <br><dt><code>list</code><dd>Print more lines. If the last lines printed were printed with a |
| <code>list</code> command, this prints lines following the last lines |
| printed; however, if the last line printed was a solitary line printed |
| as part of displaying a stack frame (see <a href="Stack.html#Stack">Examining the Stack</a>), this prints lines centered around that line. |
| |
| <br><dt><code>list -</code><dd>Print lines just before the lines last printed. |
| </dl> |
| |
| <p><a name="index-g_t_0040code_007blist_007d_002c-how-many-lines-to-display-557"></a>By default, <span class="sc">gdb</span> prints ten source lines with any of these forms of |
| the <code>list</code> command. You can change this using <code>set listsize</code>: |
| |
| |
| <a name="index-set-listsize-558"></a> |
| <dl><dt><code>set listsize </code><var>count</var><dt><code>set listsize unlimited</code><dd>Make the <code>list</code> command display <var>count</var> source lines (unless |
| the <code>list</code> argument explicitly specifies some other number). |
| Setting <var>count</var> to <code>unlimited</code> or 0 means there's no limit. |
| |
| <p><a name="index-show-listsize-559"></a><br><dt><code>show listsize</code><dd>Display the number of lines that <code>list</code> prints. |
| </dl> |
| |
| <p>Repeating a <code>list</code> command with <RET> discards the argument, |
| so it is equivalent to typing just <code>list</code>. This is more useful |
| than listing the same lines again. An exception is made for an |
| argument of ‘<samp><span class="samp">-</span></samp>’; that argument is preserved in repetition so that |
| each repetition moves up in the source file. |
| |
| <p>In general, the <code>list</code> command expects you to supply zero, one or two |
| <dfn>locations</dfn>. Locations specify source lines; there are several ways |
| of writing them (see <a href="Specify-Location.html#Specify-Location">Specify Location</a>), but the effect is always |
| to specify some source line. |
| |
| <p>Here is a complete description of the possible arguments for <code>list</code>: |
| |
| <dl> |
| <dt><code>list </code><var>location</var><dd>Print lines centered around the line specified by <var>location</var>. |
| |
| <br><dt><code>list </code><var>first</var><code>,</code><var>last</var><dd>Print lines from <var>first</var> to <var>last</var>. Both arguments are |
| locations. When a <code>list</code> command has two locations, and the |
| source file of the second location is omitted, this refers to |
| the same source file as the first location. |
| |
| <br><dt><code>list ,</code><var>last</var><dd>Print lines ending with <var>last</var>. |
| |
| <br><dt><code>list </code><var>first</var><code>,</code><dd>Print lines starting with <var>first</var>. |
| |
| <br><dt><code>list +</code><dd>Print lines just after the lines last printed. |
| |
| <br><dt><code>list -</code><dd>Print lines just before the lines last printed. |
| |
| <br><dt><code>list</code><dd>As described in the preceding table. |
| </dl> |
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