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foreach (@mergedlogs)
{
  open FH, ">>mergedlogs.txt" or die "can't open mergedlogs.txt: $!";
  print FH "$_\n";
  close FH
}

open FH, ">>mergedlogs.txt" or die "can't open mergedlogs.txt: $!";
$| = 0; # just in case
...
  print FH "$_\n";
}
close FH;