1<html lang="en"> 2<head> 3<title>Arguments - Debugging with GDB</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Debugging with GDB"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Running.html#Running" title="Running"> 9<link rel="prev" href="Starting.html#Starting" title="Starting"> 10<link rel="next" href="Environment.html#Environment" title="Environment"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 15Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Free Software'' and ``Free Software Needs 21Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 22and with the Back-Cover Texts as in (a) below. 23 24(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 25this GNU Manual. Buying copies from GNU Press supports the FSF in 26developing GNU and promoting software freedom.''--> 27<meta http-equiv="Content-Style-Type" content="text/css"> 28<style type="text/css"><!-- 29 pre.display { font-family:inherit } 30 pre.format { font-family:inherit } 31 pre.smalldisplay { font-family:inherit; font-size:smaller } 32 pre.smallformat { font-family:inherit; font-size:smaller } 33 pre.smallexample { font-size:smaller } 34 pre.smalllisp { font-size:smaller } 35 span.sc { font-variant:small-caps } 36 span.roman { font-family:serif; font-weight:normal; } 37 span.sansserif { font-family:sans-serif; font-weight:normal; } 38--></style> 39<link rel="stylesheet" type="text/css" href="../cs.css"> 40</head> 41<body> 42<div class="node"> 43<a name="Arguments"></a> 44<p> 45Next: <a rel="next" accesskey="n" href="Environment.html#Environment">Environment</a>, 46Previous: <a rel="previous" accesskey="p" href="Starting.html#Starting">Starting</a>, 47Up: <a rel="up" accesskey="u" href="Running.html#Running">Running</a> 48<hr> 49</div> 50 51<h3 class="section">4.3 Your Program's Arguments</h3> 52 53<p><a name="index-arguments-_0028to-your-program_0029-110"></a>The arguments to your program can be specified by the arguments of the 54<code>run</code> command. 55They are passed to a shell, which expands wildcard characters and 56performs redirection of I/O, and thence to your program. Your 57<code>SHELL</code> environment variable (if it exists) specifies what shell 58<span class="sc">gdb</span> uses. If you do not define <code>SHELL</code>, <span class="sc">gdb</span> uses 59the default shell (<samp><span class="file">/bin/sh</span></samp> on Unix). 60 61 <p>On non-Unix systems, the program is usually invoked directly by 62<span class="sc">gdb</span>, which emulates I/O redirection via the appropriate system 63calls, and the wildcard characters are expanded by the startup code of 64the program, not by the shell. 65 66 <p><code>run</code> with no arguments uses the same arguments used by the previous 67<code>run</code>, or those set by the <code>set args</code> command. 68 69 70<a name="index-set-args-111"></a> 71<dl><dt><code>set args</code><dd>Specify the arguments to be used the next time your program is run. If 72<code>set args</code> has no arguments, <code>run</code> executes your program 73with no arguments. Once you have run your program with arguments, 74using <code>set args</code> before the next <code>run</code> is the only way to run 75it again without arguments. 76 77 <p><a name="index-show-args-112"></a><br><dt><code>show args</code><dd>Show the arguments to give your program when it is started. 78</dl> 79 80 </body></html> 81 82