3.2.rb

#! /usr/bin/env ruby

if ARGV.first
  File.open(ARGV.first, 'r') do |file|
    counter = 0
    file.each_line { |line| counter += 1 }
    puts "#{counter} lines"
  end
else
  puts "Pass the path to the file you want to read"
end

console_program_1.rb

#! /usr/bin/env ruby

print "Enter the size: "
number = gets.chomp
number.to_i.times { |n| print '#' }
puts