A small variation made to Chris Pine's batch photo re-namer example from Chapter 11 in Learning to Program.

screenshot-rename.rb

puts 'Where do you store your screenshots? Please paste the entire directory path.'

store = gets.chomp

Dir.chdir store

pic_names = Dir["#{store}/Screen Shot*.{png}"]

puts 'What would you like to call this batch?'

batch_name = gets.chomp

puts

print "Downloading #{pic_names.length} files: "

pic_number = 1

pic_names.each do |name|
  print '.' #progress bar
  new_name = if pic_number < 10
    "#{batch_name}0#{pic_number}.png"
  else
    "#{batch_name}#{pic_number}.png"
  end
  
File.rename name, new_name
  pic_number = pic_number + 1
end

puts
puts 'Donesies.'