es the extended usage<br>
              <b>-d</b> : delta in seconds (default is 300s)<br>
              <b>-w</b> : warning levels<br>
              <b>-c</b> : critical levels<br>
            </p>
            <p class="SectionBody"><b>-d</b>: delta time<br>

              You can put the delta time as an option : the &quot;delta&quot; 

              is the prefered time between two values that the script will use 

              to calculate the average Kbytes/s or error/min. The delta time sh