make_it_snow.rb

trap("SIGINT") { exit! }

total_width = `stty size`.scan(/\d+/)[1].to_i # terminal width

snokflakes = {}

puts "\033[2J"; # clearing output

loop do
  snokflakes[rand(total_width)] = 0

  snokflakes.each do |column, row|
    snokflakes[column] += 1 # increment row value

    print "\033[#{row};#{column}H" + " " # move cursor to [row, column] and replace current ❃ by a space
    print "\033[#{row + 1};#{column}H"   # move cursor down (row + 1)
    print "❃ "                           # print snowflake
    print "\033[0;0H"                    # move cursor to top/left position (cursor doesn't follow snowflake)
  end
  sleep 0.1
end

the_matrix.rb

clear_screen = -> { puts "\033[2J" }

trap("SIGINT") do
  clear_screen.call

  puts "Morpheus: 'Follow me.'"
  exit!
end

total_width = `stty size`.scan(/\d+/)[1].to_i # terminal width

chars = {}
eligible_chars = ('a'..'z').to_a + ('1'..'9').to_a

clear_screen.call

loop do
  chars[rand(total_width)] = 0

  chars.each do |column, row|
    chars[column] += 1 # increment row value

    print "\033[#{row + 1};#{column}H" # move cursor down (row + 1)
    print "#{eligible_chars.sample} "  # print random character
    print "\033[0;0H"                  # move cursor to top/left position
  end
  sleep 0.1
end