my $output_file = "mergedlogs.txt";
open my $output_fh, ">", $output_file or die "Can't open $output_file: $!";

{
  local $| = 0;
  local $\ = "\n"; # Automatically append \n
  foreach (@mergedlogs)
  {
    print $output_fh $_; # "$_\n" copies $_ into a new string before appending \n
  }
}

close $output_fh;