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<h4 class="subsection">2.1.2 Choosing Modes</h4>

<p>You can run <span class="sc">gdb</span> in various alternative modes&mdash;for example, in
batch mode or quiet mode.

     <dl>
<dt><code>-nx</code><dt><code>-n</code><dd><a name="index-g_t_0040code_007b_002d_002dnx_007d-21"></a><a name="index-g_t_0040code_007b_002dn_007d-22"></a>Do not execute commands found in any initialization files.  Normally,
<span class="sc">gdb</span> executes the commands in these files after all the command
options and arguments have been processed.  See <a href="Command-Files.html#Command-Files">Command Files</a>.

     <br><dt><code>-quiet</code><dt><code>-silent</code><dt><code>-q</code><dd><a name="index-g_t_0040code_007b_002d_002dquiet_007d-23"></a><a name="index-g_t_0040code_007b_002d_002dsilent_007d-24"></a><a name="index-g_t_0040code_007b_002dq_007d-25"></a>&ldquo;Quiet&rdquo;.  Do not print the introductory and copyright messages.  These
messages are also suppressed in batch mode.

     <br><dt><code>-batch</code><dd><a name="index-g_t_0040code_007b_002d_002dbatch_007d-26"></a>Run in batch mode.  Exit with status <code>0</code> after processing all the
command files specified with &lsquo;<samp><span class="samp">-x</span></samp>&rsquo; (and all commands from
initialization files, if not inhibited with &lsquo;<samp><span class="samp">-n</span></samp>&rsquo;).  Exit with
nonzero status if an error occurs in executing the <span class="sc">gdb</span> commands
in the command files.  Batch mode also disables pagination, sets unlimited
terminal width and height see <a href="Screen-Size.html#Screen-Size">Screen Size</a>, and acts as if <kbd>set confirm
off</kbd> were in effect (see <a href="Messages_002fWarnings.html#Messages_002fWarnings">Messages/Warnings</a>).

     <p>Batch mode may be useful for running <span class="sc">gdb</span> as a filter, for
example to download and run a program on another computer; in order to
make this more useful, the message

     <pre class="smallexample">          Program exited normally.
</pre>
     <p class="noindent">(which is ordinarily issued whenever a program running under
<span class="sc">gdb</span> control terminates) is not issued when running in batch
mode.

     <br><dt><code>-batch-silent</code><dd><a name="index-g_t_0040code_007b_002d_002dbatch_002dsilent_007d-27"></a>Run in batch mode exactly like &lsquo;<samp><span class="samp">-batch</span></samp>&rsquo;, but totally silently.  All
<span class="sc">gdb</span> output to <code>stdout</code> is prevented (<code>stderr</code> is
unaffected).  This is much quieter than &lsquo;<samp><span class="samp">-silent</span></samp>&rsquo; and would be useless
for an interactive session.

     <p>This is particularly useful when using targets that give &lsquo;<samp><span class="samp">Loading section</span></samp>&rsquo;
messages, for example.

     <p>Note that targets that give their output via <span class="sc">gdb</span>, as opposed to
writing directly to <code>stdout</code>, will also be made silent.

     <br><dt><code>-return-child-result</code><dd><a name="index-g_t_0040code_007b_002d_002dreturn_002dchild_002dresult_007d-28"></a>The return code from <span class="sc">gdb</span> will be the return code from the child
process (the process being debugged), with the following exceptions:

          <ul>
<li><span class="sc">gdb</span> exits abnormally.  E.g., due to an incorrect argument or an
internal error.  In this case the exit code is the same as it would have been
without &lsquo;<samp><span class="samp">-return-child-result</span></samp>&rsquo;. 
<li>The user quits with an explicit value.  E.g., &lsquo;<samp><span class="samp">quit 1</span></samp>&rsquo;. 
<li>The child process never runs, or is not allowed to terminate, in which case
the exit code will be -1. 
</ul>

     <p>This option is useful in conjunction with &lsquo;<samp><span class="samp">-batch</span></samp>&rsquo; or &lsquo;<samp><span class="samp">-batch-silent</span></samp>&rsquo;,
when <span class="sc">gdb</span> is being used as a remote program loader or simulator
interface.

     <br><dt><code>-nowindows</code><dt><code>-nw</code><dd><a name="index-g_t_0040code_007b_002d_002dnowindows_007d-29"></a><a name="index-g_t_0040code_007b_002dnw_007d-30"></a>&ldquo;No windows&rdquo;.  If <span class="sc">gdb</span> comes with a graphical user interface
(GUI) built in, then this option tells <span class="sc">gdb</span> to only use the command-line
interface.  If no GUI is available, this option has no effect.

     <br><dt><code>-windows</code><dt><code>-w</code><dd><a name="index-g_t_0040code_007b_002d_002dwindows_007d-31"></a><a name="index-g_t_0040code_007b_002dw_007d-32"></a>If <span class="sc">gdb</span> includes a GUI, then this option requires it to be
used if possible.

     <br><dt><code>-cd </code><var>directory</var><dd><a name="index-g_t_0040code_007b_002d_002dcd_007d-33"></a>Run <span class="sc">gdb</span> using <var>directory</var> as its working directory,
instead of the current directory.

     <br><dt><code>-fullname</code><dt><code>-f</code><dd><a name="index-g_t_0040code_007b_002d_002dfullname_007d-34"></a><a name="index-g_t_0040code_007b_002df_007d-35"></a><span class="sc">gnu</span> Emacs sets this option when it runs <span class="sc">gdb</span> as a
subprocess.  It tells <span class="sc">gdb</span> to output the full file name and line
number in a standard, recognizable fashion each time a stack frame is
displayed (which includes each time your program stops).  This
recognizable format looks like two &lsquo;<samp><span class="samp">\032</span></samp>&rsquo; characters, followed by
the file name, line number and character position separated by colons,
and a newline.  The Emacs-to-<span class="sc">gdb</span> interface program uses the two
&lsquo;<samp><span class="samp">\032</span></samp>&rsquo; characters as a signal to display the source code for the
frame.

     <br><dt><code>-epoch</code><dd><a name="index-g_t_0040code_007b_002d_002depoch_007d-36"></a>The Epoch Emacs-<span class="sc">gdb</span> interface sets this option when it runs
<span class="sc">gdb</span> as a subprocess.  It tells <span class="sc">gdb</span> to modify its print
routines so as to allow Epoch to display values of expressions in a
separate window.

     <br><dt><code>-annotate </code><var>level</var><dd><a name="index-g_t_0040code_007b_002d_002dannotate_007d-37"></a>This option sets the <dfn>annotation level</dfn> inside <span class="sc">gdb</span>.  Its
effect is identical to using &lsquo;<samp><span class="samp">set annotate </span><var>level</var></samp>&rsquo;
(see <a href="Annotations.html#Annotations">Annotations</a>).  The annotation <var>level</var> controls how much
information <span class="sc">gdb</span> prints together with its prompt, values of
expressions, source lines, and other types of output.  Level 0 is the
normal, level 1 is for use when <span class="sc">gdb</span> is run as a subprocess of
<span class="sc">gnu</span> Emacs, level 3 is the maximum annotation suitable for programs
that control <span class="sc">gdb</span>, and level 2 has been deprecated.

     <p>The annotation mechanism has largely been superseded by <span class="sc">gdb/mi</span>
(see <a href="GDB_002fMI.html#GDB_002fMI">GDB/MI</a>).

     <br><dt><code>--args</code><dd><a name="index-g_t_0040code_007b_002d_002dargs_007d-38"></a>Change interpretation of command line so that arguments following the
executable file are passed as command line arguments to the inferior. 
This option stops option processing.

     <br><dt><code>-baud </code><var>bps</var><dt><code>-b </code><var>bps</var><dd><a name="index-g_t_0040code_007b_002d_002dbaud_007d-39"></a><a name="index-g_t_0040code_007b_002db_007d-40"></a>Set the line speed (baud rate or bits per second) of any serial
interface used by <span class="sc">gdb</span> for remote debugging.

     <br><dt><code>-l </code><var>timeout</var><dd><a name="index-g_t_0040code_007b_002dl_007d-41"></a>Set the timeout (in seconds) of any communication used by <span class="sc">gdb</span>
for remote debugging.

     <br><dt><code>-tty </code><var>device</var><dt><code>-t </code><var>device</var><dd><a name="index-g_t_0040code_007b_002d_002dtty_007d-42"></a><a name="index-g_t_0040code_007b_002dt_007d-43"></a>Run using <var>device</var> for your program's standard input and output. 
<!-- FIXME: kingdon thinks there is more to -tty.  Investigate. -->

     <!-- resolve the situation of these eventually -->
     <br><dt><code>-tui</code><dd><a name="index-g_t_0040code_007b_002d_002dtui_007d-44"></a>Activate the <dfn>Text User Interface</dfn> when starting.  The Text User
Interface manages several text windows on the terminal, showing
source, assembly, registers and <span class="sc">gdb</span> command outputs
(see <a href="TUI.html#TUI"><span class="sc">gdb</span> Text User Interface</a>).  Alternatively, the
Text User Interface can be enabled by invoking the program
&lsquo;<samp><span class="samp">gdbtui</span></samp>&rsquo;.  Do not use this option if you run <span class="sc">gdb</span> from
Emacs (see <a href="Emacs.html#Emacs">Using <span class="sc">gdb</span> under <span class="sc">gnu</span> Emacs</a>).

     <!-- @item -xdb -->
     <!-- @cindex @code{-xdb} -->
     <!-- Run in XDB compatibility mode, allowing the use of certain XDB commands. -->
     <!-- For information, see the file @file{xdb_trans.html}, which is usually -->
     <!-- installed in the directory @code{/opt/langtools/wdb/doc} on HP-UX -->
     <!-- systems. -->
     <br><dt><code>-interpreter </code><var>interp</var><dd><a name="index-g_t_0040code_007b_002d_002dinterpreter_007d-45"></a>Use the interpreter <var>interp</var> for interface with the controlling
program or device.  This option is meant to be set by programs which
communicate with <span class="sc">gdb</span> using it as a back end. 
See <a href="Interpreters.html#Interpreters">Command Interpreters</a>.

     <p>&lsquo;<samp><span class="samp">--interpreter=mi</span></samp>&rsquo; (or &lsquo;<samp><span class="samp">--interpreter=mi2</span></samp>&rsquo;) causes
<span class="sc">gdb</span> to use the <span class="sc">gdb/mi</span><dfn> interface</dfn> (see <a href="GDB_002fMI.html#GDB_002fMI">The <span class="sc">gdb/mi</span> Interface</a>) included since <span class="sc">gdb</span> version 6.0.  The
previous <span class="sc">gdb/mi</span> interface, included in <span class="sc">gdb</span> version 5.3 and
selected with &lsquo;<samp><span class="samp">--interpreter=mi1</span></samp>&rsquo;, is deprecated.  Earlier
<span class="sc">gdb/mi</span> interfaces are no longer supported.

     <br><dt><code>-write</code><dd><a name="index-g_t_0040code_007b_002d_002dwrite_007d-46"></a>Open the executable and core files for both reading and writing.  This
is equivalent to the &lsquo;<samp><span class="samp">set write on</span></samp>&rsquo; command inside <span class="sc">gdb</span>
(see <a href="Patching.html#Patching">Patching</a>).

     <br><dt><code>-statistics</code><dd><a name="index-g_t_0040code_007b_002d_002dstatistics_007d-47"></a>This option causes <span class="sc">gdb</span> to print statistics about time and
memory usage after it completes each command and returns to the prompt.

     <br><dt><code>-version</code><dd><a name="index-g_t_0040code_007b_002d_002dversion_007d-48"></a>This option causes <span class="sc">gdb</span> to print its version number and
no-warranty blurb, and exit.

   </dl>

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