Progress bar

class Float
  def to_percent
    (self*100).to_s.gsub(/(.\.)(\d\d).*/,'\1\2')
  end
end

$stdout.sync = true
def spinner(i)
  return(['\\','|','/','-'][i%4])
end

150.times do |i|
  printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\bWorking: %s %3.2f%s ",spinner(i),((i.to_f/150.0)).to_f.to_percent,"%")
  sleep 0.1;
end