<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Copyright (C) 1988-2020 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being "Free Software" and "Free Software Needs Free Documentation", with the Front-Cover Texts being "A GNU Manual," and with the Back-Cover Texts as in (a) below. (a) The FSF's Back-Cover Text is: "You are free to copy and modify this GNU Manual. Buying copies from GNU Press supports the FSF in developing GNU and promoting software freedom." --> <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Arguments (Debugging with GDB)</title> <meta name="description" content="Arguments (Debugging with GDB)"> <meta name="keywords" content="Arguments (Debugging with GDB)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <link href="index.html#Top" rel="start" title="Top"> <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> <link href="Running.html#Running" rel="up" title="Running"> <link href="Environment.html#Environment" rel="next" title="Environment"> <link href="Starting.html#Starting" rel="prev" title="Starting"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} blockquote.indentedblock {margin-right: 0em} blockquote.smallindentedblock {margin-right: 0em; font-size: smaller} blockquote.smallquotation {font-size: smaller} div.display {margin-left: 3.2em} div.example {margin-left: 3.2em} div.lisp {margin-left: 3.2em} div.smalldisplay {margin-left: 3.2em} div.smallexample {margin-left: 3.2em} div.smalllisp {margin-left: 3.2em} kbd {font-style: oblique} pre.display {font-family: inherit} pre.format {font-family: inherit} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: inherit; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: inherit; font-size: smaller} pre.smalllisp {font-size: smaller} span.nolinebreak {white-space: nowrap} span.roman {font-family: initial; font-weight: normal} span.sansserif {font-family: sans-serif; font-weight: normal} ul.no-bullet {list-style: none} --> </style> </head> <body lang="en"> <a name="Arguments"></a> <div class="header"> <p> Next: <a href="Environment.html#Environment" accesskey="n" rel="next">Environment</a>, Previous: <a href="Starting.html#Starting" accesskey="p" rel="prev">Starting</a>, Up: <a href="Running.html#Running" accesskey="u" rel="up">Running</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> </div> <hr> <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> </body> </html>