<p>In modules/exec/doc/exec_admin.xml:</p>
<pre style='color:#555'>&gt; +                &lt;para&gt;
&gt; +                WARNING: &quot;input&quot;/&quot;output&quot;/&quot;error&quot; parameters are not designed for a large amount of
&gt; +                data so one should be careful when using them because server could considerably be
&gt; +                slowed down.
&gt; +                &lt;/para&gt;
&gt; +                &lt;para&gt;
&gt; +                This function can be used from REQUEST_ROUTE, FAILURE_ROUTE,
&gt; +                LOCAL_ROUTE, STARTUP_ROUTE, TIMER_ROUTE, EVENT_ROUTE, ONREPLY_ROUTE.
&gt; +                &lt;/para&gt;
&gt; +                &lt;example&gt;
&gt; +                &lt;title&gt;&lt;function moreinfo=&quot;none&quot;&gt;exec&lt;/function&gt; usage&lt;/title&gt;
&gt; +                &lt;programlisting format=&quot;linespecific&quot;&gt;
&gt; +...
&gt; +$avp(env) = &quot;a&quot;;
&gt; +$avp(env) = &quot;b&quot;;
&gt; +exec(&quot;ls -l&quot;, &quot;$var(out)&quot;,, &quot;$avp(env)&quot;);
</pre>
<p>This example does not take stderr into account.</p>

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