title: .Error message wrong # args: should be "for start test next command" coming
body: <p>I got the error message <code>wrong # args: should be "for start test next command</code> when trying to run the following code:</p>
  
  <pre><code>proc finish {} {
          global ns nf
          $ns flush-trace
      #Close the trace file
          close $nf
      #Execute nam on the trace file
          exec nam out.nam &amp;
          exit 0
  }
  
  #Create 50 nodes
  
  for {set i 0} {$i&lt;51} {incr i} {
  
  set n($i) [$ns node]
  }
  
  #Create a duplex link between the nodes
  $ns duplex-link $n0 $n1 1Mb 10ms DropTail
  </code></pre>