use Sort::Key qw(ikeysort);

my $buffer;

open (INPF,"<input.dat") or die "Can't open input.dat: $!\n";
for (ikeysort {/^\w+\s+(\d+)/; $1} <INPF>) {
  m/^(\w+)\s+(\d+)\s+(\w+)(.*)$/ or die "Unable to match any lines:$!\
+n";
  if ($2 < 90) { $buffer .= "<tr bgcolor='#00FF00'><td>$1</td><td>$2</
+td><td>$3</td><td>$4</td></tr>\n";
  } elsif ($2 < 180) {
    $buffer .= "<tr bgcolor='#FF6600'><td>$1</td><td>$2</td><td>$3</td
+><td>$4</td></tr>\n";
  } else {
    $buffer .= "<tr bgcolor='#FF0000'><td>$1</td><td>$2</td><td>$3</td
+><td>$4</td></tr>\n";
  }
}
close INPF;

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In reply to Re: most efficient buffer sort by salva
in thread most efficient buffer sort by Anonymous Monk

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