/code> use <code>system2</code> and divert stderr to
temporary file to record error messages and warnings from GRASS modules.</p></dd>


<dt id="arg-string">string<a class="anchor" aria-label="anchor" href="#arg-string"></a></dt>
<dd><p>a string representing <em>one</em> full GRASS statement, using shell
syntax: command name, optionally followed by flags and parameters, all
separated by whitespaces. Parameters follow the key=value format; if
’value’ contains spaces, then ’value’ must be quoted</p></