<vbox scrollable="true" width="600" height="400">
<variable>CMDOUTPUT</variable>
<input file>/tmp/cmdout.txt</input>
<text><label>Command:</label></text>
<entry><variable>CMDTORUN</variable></entry>
<action>$CMDTORUN > /tmp/cmdout.txt</action>
<action>refresh:CMDOUTPUT</action>