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| <h3 class="section">4.3 Your Program's Arguments</h3> |
| |
| <p><a name="index-arguments-_0028to-your-program_0029-126"></a>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 |
| <span class="sc">gdb</span> uses. If you do not define <code>SHELL</code>, <span class="sc">gdb</span> uses |
| the default shell (<samp><span class="file">/bin/sh</span></samp> on Unix). |
| |
| <p>On non-Unix systems, the program is usually invoked directly by |
| <span class="sc">gdb</span>, 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><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. |
| |
| |
| <a name="index-set-args-127"></a> |
| <dl><dt><code>set args</code><dd>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-128"></a><br><dt><code>show args</code><dd>Show the arguments to give your program when it is started. |
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