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| <title>Debugging with GDB: Arguments</title> |
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| <a name="Arguments"></a> |
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| <a name="Your-Program_0027s-Arguments"></a> |
| <h3 class="section">4.3 Your Program’s Arguments</h3> |
| |
| <a name="index-arguments-_0028to-your-program_0029"></a> |
| <p>The arguments to your program can be specified by the arguments of the |
| <code>run</code> command. |
| They are passed to a shell, which expands wildcard characters and |
| performs redirection of I/O, and thence to your program. Your |
| <code>SHELL</code> environment variable (if it exists) specifies what shell |
| <small>GDB</small> uses. If you do not define <code>SHELL</code>, <small>GDB</small> uses |
| the default shell (<samp>/bin/sh</samp> on Unix). |
| </p> |
| <p>On non-Unix systems, the program is usually invoked directly by |
| <small>GDB</small>, which emulates I/O redirection via the appropriate system |
| calls, and the wildcard characters are expanded by the startup code of |
| the program, not by the shell. |
| </p> |
| <p><code>run</code> with no arguments uses the same arguments used by the previous |
| <code>run</code>, or those set by the <code>set args</code> command. |
| </p> |
| <dl compact="compact"> |
| <dd><a name="index-set-args"></a> |
| </dd> |
| <dt><code>set args</code></dt> |
| <dd><p>Specify the arguments to be used the next time your program is run. If |
| <code>set args</code> has no arguments, <code>run</code> executes your program |
| with no arguments. Once you have run your program with arguments, |
| using <code>set args</code> before the next <code>run</code> is the only way to run |
| it again without arguments. |
| </p> |
| <a name="index-show-args"></a> |
| </dd> |
| <dt><code>show args</code></dt> |
| <dd><p>Show the arguments to give your program when it is started. |
| </p></dd> |
| </dl> |
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