#!/usr/bin/perl

use strict;
use warnings;
use Fcntl;
use Tie::File;
use File::CountLines qw(count_lines);

my $file = shift or die "usage: $0 file\n";
tie my @lines, 'Tie::File', $file, mode => O_RDONLY
  or die "error: $!";

my $number_of_lines = count_lines($file);
print "Number of lines: $number_of_lines", "\n";
print $lines[$#lines-16], "\n";
print $lines[$#lines], "\n";