awk - choose the newest file and use getline to read it -

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There is a problem with a small awk script, I'm trying to select some log files for the latest and then Use the getline to read it. The problem is that if I do not send it to any script in the script it is okay.

This works 

  echo | Myprog.awk

this is not 

  myprog.awk

myprog.awk 

  BEGIN {# Find the latest file command = "ls -alrt | tail-1 | cut-in 59-100" order | Getline logfile close (command)} while {(getline> > 0) {#do magic print $ 0}}

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