count.rb

names = File.read(ARGV.first || 'assistencia.txt').split("\n")
names = names.sort_by do |name|
  name.downcase.split(' ').last
end

present = []
absent = []

names.each do |name|
  print "#{name} (y/n):"
  answer = gets.chomp.strip.downcase

  if answer == 'q'
    exit
  end

  if ['', y].has?(answer)
    present << name
  else
    absent << name
  end
end

puts "#{present.count} pessoas assistiram a reunião dentre os regulares. Verifique os não regulares."