progress_indicator.rb

# adapted from http://snippets.dzone.com/posts/show/3760

total = 123

puts "starting #{total} conversions..."
reset = "\r" + "\e[0K"

(1..total).each do |i|
  print "#{reset}#{i} / #{total}"
  sleep(0.01)
  $stdout.flush
end

print "#{reset}"
$stdout.flush
puts "conversion complete"