Automatically log into pandora with pianobar.

piano.rb

#! /usr/lib/ruby
require 'open3'

Open3.popen2('pianobar', 'r+') do |stdin, stdout|
  out = ''
  sleep_now = false
  loop do
    o, i, _ = IO.select([stdout], [stdin], nil, 10000000)
    unless o.first.nil?
      out += o.first.readpartial(8000)
    end
    case out
    when /\n$/
      print out
      out.clear
    when /Username:\ /
      print out
      out.clear
      i.first.write "youremail@example.com"
    when /Password:\ /
      print out
      out.clear
      i.first.write "supersecret\n"
    when /Select station:\ /
      print out
      out.clear
      input_complete = true
      i.first.write "#{gets}\n"
      sleep_now = true
    end

    # Otherwise the script pegs CPU @ 100%
    if sleep_now
      print out
      out.clear
      sleep(10)
    end

  end
end

sleep_now should be nil until you issue your station's number.

https://gist.github.com/809428

Perhaps it has issues on 1.9.1? Could try upgrading to 1.9.2.