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<title>avram - a virtual machine code interpreter: 2.6.3 Output From Non-interactive Applications</title>

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<a name="Output-From-Non_002dinteractive-Applications"></a>
<table cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="Input-for-Mapped-Applications.html#Input-for-Mapped-Applications" title="Previous section in reading order"> &lt; </a>]</td>
<td valign="middle" align="left">[<a href="Output-From-Interactive-Applications.html#Output-From-Interactive-Applications" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="Virtual-Machine-Specification.html#Virtual-Machine-Specification" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="Parameter-Mode-Interface.html#Parameter-Mode-Interface" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Library-Reference.html#Library-Reference" title="Next chapter"> &gt;&gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="avram_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Function-Index.html#Function-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="avram_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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<hr size="1">
<a name="Output-From-Non_002dinteractive-Applications-1"></a>
<h3 class="subsection">2.6.3 Output From Non-interactive Applications</h3>

<a name="index-interactive-command-line-option-1"></a>
<a name="index-step-command-line-option-1"></a>
<p>If a parameter mode application is not invoked with either of the
&lsquo;<samp>--interactive</samp>&rsquo; or &lsquo;<samp>--step</samp>&rsquo; options,
then it is deemed to be non-interactive, and therefore does not concern
itself with executing shell commands. Instead, it simply specifies a
list of output files to be created or updated on its behalf by <code>avram</code>.
</p>
<p>The files are described by a list of quadruples
<code>((<var>overwrite</var>,<var>path</var>),(<var>preamble</var>,<var>contents</var>))</code>,
with one quadruple for each file.
</p>
<a name="index-preamble-4"></a>
<a name="index-paths-4"></a>
<a name="index-standard-input-8"></a>
<a name="index-standard-output-2"></a>
<p>In each quadruple, the <var>path</var>, <var>preamble</var>, and <var>contents</var>
fields have the same interpretations as in the list of files in the
input data structure described in <a href="Input-Data-Structure.html#Input-Data-Structure">Input Data Structure</a>, except that a
<code>nil</code> path refers to standard output rather than to standard input.
</p>
<p>The <var>overwrite</var> field in each quadruple tells whether the file
<a name="index-appending-to-files"></a>
should be overwritten or appended. If the <var>overwrite</var> field is
<code>nil</code> (i.e., the representation for the Boolean value of
<code>false</code>) and a file already exists at the given path, the new
contents will be appended to it.  If the <var>overwrite</var> field is
anything other than <code>nil</code> and/or no file exists with the given
path, a new file is written or the extant one is overwritten. Note that
the data file format specified in <a href="File-Format.html#File-Format">File Format</a> precludes appending
anything to it, but the format of existing output files is not checked
and nothing prevents data or text from being appended to one.
</p>
<hr size="1">
<table cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="Input-for-Mapped-Applications.html#Input-for-Mapped-Applications" title="Previous section in reading order"> &lt; </a>]</td>
<td valign="middle" align="left">[<a href="Output-From-Interactive-Applications.html#Output-From-Interactive-Applications" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="Virtual-Machine-Specification.html#Virtual-Machine-Specification" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="Parameter-Mode-Interface.html#Parameter-Mode-Interface" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Library-Reference.html#Library-Reference" title="Next chapter"> &gt;&gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="avram.html#Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="avram_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="Function-Index.html#Function-Index" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="avram_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
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