[ns] how to use $ns create-trace type file src dst op

[pangpang]

Can anyone help me in using this command? 

Suppose my topology is 
s0
  \\
  r1==r2==d0
 //
s1

I don't know where I should put this command in my script. If I want to get
statistics of drops btw link s0 and d0, should I do things like:

set ns [new Simulator]
$ns create-trace Drop file s0 d0

and then the creating nodes, links, sources part?

I think I missed something... also, what should the "file" be?

Thanks for any advice!
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