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