title: tcpdump suppress console output in script & write to file
body: <p>In a bash script I need to run a tcpdump command and save the output to a file however when I do that via <code>&gt; /tmp/test.txt</code> i still get the following output in the console:</p>
  
  <pre><code>tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes
  1 packet captured
  1 packet received by filter
  0 packets dropped by kernel
  </code></pre>
  
  <p>However I do wnat the script to wait for the command to complete before continuing.</p>
  
  <p>is it possible to supress this output? </p>