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<h4 class="subsection">2.6.3 Output From Non-interactive Applications</h4>

<p><a name="index-g_t_0040code_007binteractive_007d-command-line-option-221"></a><a name="index-g_t_0040code_007bstep_007d-command-line-option-222"></a>If a parameter mode application is not invoked with either of the
<samp><span class="option">--interactive</span></samp> or <samp><span class="option">--step</span></samp> 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>The files are described by a list of quadruples
<code>((</code><var>overwrite</var><code>,</code><var>path</var><code>),(</code><var>preamble</var><code>,</code><var>contents</var><code>))</code>,
with one quadruple for each file.

   <p><a name="index-preamble-223"></a><a name="index-paths-224"></a><a name="index-standard-input-225"></a><a name="index-standard-output-226"></a>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>The <var>overwrite</var> field in each quadruple tells whether the file
<a name="index-appending-to-files-227"></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.

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