Convert multiple jpg files to a pdf document

jpg2pdf.rb

# get the actual directory
root_path = Dir.pwd

# all files on the actual directory
Dir.glob(File.join root_path, '*').each do |file|
  # check that is a directory
  if File.directory? file
    print "Converting #{file}... "

    # path where image files are
    path = File.join file, '*.jpg'

    # use imagemagick convert command
    `/usr/local/bin/convert '#{path}' '#{file}.pdf'`

    puts 'done!'
  end
end