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<!doctype html public "-//W3C//DTD HTML 3.2 Final//EN">
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<title>WN Server Side Includes that Execute a Program</title>
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<h2 align="center"><em>WN</em> Server Side Includes that Execute a
Program</h2>
<hr size="4">
<blockquote>
<p>
Is it possible to do a server-side include such as the following:
</p>
<blockquote>
<code>
<!-- #echo var="LAST_MODIFIED" -->
</code>
</blockquote>
<p>
I've tried it numerous ways and failed every time -- so I figured it
was time for a definitive answer. I can certainly live without them
but they would be nice to have.
</p>
</blockquote>
<h3>1 <a name="howto">How it Works</a></h3>
<p>
This is done with a server side include that executes a program. To see
this example in action try <a
href="index.html"><code>index.html</code></a>.
</p>
<p>
Here is an example of how to use scripts as server side includes. This
is not a <a href="http://hoohoo.ncsa.uiuc.edu/cgi/">CGI/1.1</a> program,
but something similar could be done with <a
href="http://hoohoo.ncsa.uiuc.edu/cgi/">CGI/1.1</a>. Assuming that the
program "<code><a href="#program">counter.cgi</a></code>" is in the same
directory as "<code>foo.html</code>" put something like:
</p>
<blockquote>
<code>
<a href="../appendixB.html#fdir.file">File=</a>foo.html
<br>
<a href="../appendixB.html#fdir.includes">Includes=</a>!counter.cgi
</code>
</blockquote>
<p>
in your <a href="../index_desc.html#index"><code>index</code></a> file.
Then put:
</p>
<blockquote>
<code>
<a href="../parse.html#including"><!-- #include --></a>
</code>
</blockquote>
<p>
on a line with no leading whitespace in the file <code>foo.html</code>.
The program <code>counter.cgi</code> gives the current count of accesses
to this page and also prints the last-modified date. It should be easy
to modify for your needs.
</p>
<p>
There are a couple of permissions issues. The user id under which the
server runs (e.g. "<code>nobody</code>") must have permission to execute
<code>counter.cgi</code> and to read and write the file
<code>/tmp/wncount</code>.
</p>
<h3>2 <a name="program">The Program <code>counter.cgi</code></a></h3>
<p>
Here is the <a href="http://www.perl.org">perl</a> program:
</p>
<blockquote>
<pre>
<!-- #include -->
</pre>
</blockquote>
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<address>
<em>WN</em> version 2.0.0
<br>
Copyright © 1998 <a href="mailto:john@math.nwu.edu">John Franks
<john@math.nwu.edu></a>
<br>
licensed under the <a href="http://www.gnu.org/copyleft/gpl.html">GNU
General Public License</a>
<br>
last-modified: Sun, 10 May 1998 18:07:18 GMT
</address>
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