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use Benchmark;

...
      close FILE;
  },
});

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Benchmark: timing 1 iterations of Trial1 While, Trial2 Foreach...
Trial1 While:  0 wallclock secs ( 0.00 usr +  0.00 sys =  0.00 CPU)
Trial2 Foreach: 17 wallclock secs (10.77 usr +  1.56 sys = 12.33 CPU) 
+@  0.08/s (n=1)