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<a name="Keyword-Commands"></a>
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<a name="Keyword-Commands-1"></a>
<h3 class="section">38.2 Keyword Commands</h3>
<p>Keyword commands are special keywords which are not interpreted as Maxima
expressions. A keyword command can be entered at the Maxima prompt or the
debugger prompt, although not at the break prompt.
Keyword commands start with a colon, ’<code>:</code>’.
For example, to evaluate a Lisp form you
may type <code>:lisp</code> followed by the form to be evaluated.
</p>
<div class="example">
<pre class="example">(%i1) :lisp (+ 2 3)
5
</pre></div>
<p>The number of arguments taken depends on the particular command. Also,
you need not type the whole command, just enough to be unique among
the break keywords. Thus <code>:br</code> would suffice for <code>:break</code>.
</p>
<p>The keyword commands are listed below.
</p>
<dl compact="compact">
<dt><code>:break F n</code></dt>
<dd><p>Set a breakpoint in function <code>F</code> at line offset <code>n</code>
from the beginning of the function.
If <code>F</code> is given as a string, then it is assumed to be
a file, and <code>n</code> is the offset from the beginning of the file.
The offset is optional. If not given, it is assumed to be zero
(first line of the function or file).
</p></dd>
<dt><code>:bt</code></dt>
<dd><p>Print a backtrace of the stack frames
</p></dd>
<dt><code>:continue</code></dt>
<dd><p>Continue the computation
</p></dd>
<dt><code>:delete</code></dt>
<dd><p>Delete the specified breakpoints, or all if none are specified
</p></dd>
<dt><code>:disable</code></dt>
<dd><p>Disable the specified breakpoints, or all if none are specified
</p></dd>
<dt><code>:enable</code></dt>
<dd><p>Enable the specified breakpoints, or all if none are specified
</p></dd>
<dt><code>:frame n</code></dt>
<dd><p>Print stack frame <code>n</code>, or the current frame if none is specified
</p></dd>
<dt><code>:help</code></dt>
<dd><p>Print help on a debugger command, or all commands if none is specified
</p></dd>
<dt><code>:info</code></dt>
<dd><p>Print information about item
</p></dd>
<dt><code>:lisp some-form</code></dt>
<dd><p>Evaluate <code>some-form</code> as a Lisp form
</p></dd>
<dt><code>:lisp-quiet some-form</code></dt>
<dd><p>Evaluate Lisp form <code>some-form</code> without any output
</p></dd>
<dt><code>:next</code></dt>
<dd><p>Like <code>:step</code>, except <code>:next</code> steps over function calls
</p></dd>
<dt><code>:quit</code></dt>
<dd><p>Quit the current debugger level without completing the computation
</p></dd>
<dt><code>:resume</code></dt>
<dd><p>Continue the computation
</p></dd>
<dt><code>:step</code></dt>
<dd><p>Continue the computation until it reaches a new source line
</p></dd>
<dt><code>:top</code></dt>
<dd><p>Return to the Maxima prompt (from any debugger level) without
completing the computation
</p></dd>
</dl>
<p>Note: Keyword commands must (currently) start at the beginning of a line.
Not even a single space character is allowed before the colon.
</p>
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Next: <a href="maxima_179.html#Functions-and-Variables-for-Debugging" accesskey="n" rel="next">Functions and Variables for Debugging</a>, Previous: <a href="maxima_177.html#Source-Level-Debugging" accesskey="p" rel="previous">Source Level Debugging</a>, Up: <a href="maxima_176.html#Debugging" accesskey="u" rel="up">Debugging</a> [<a href="maxima_toc.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="maxima_423.html#Function-and-Variable-Index" title="Index" rel="index">Index</a>]</p>
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