pdf2text.rb

Encoding.default_external = 'UTF-8'
Encoding.default_internal = 'UTF-8'

require 'poppler'

path = ARGV.shift

unless path
  $stderr.puts 'Specify PDF file'
  abort
end

pdf = Poppler::Document.new(File.read(path))
0.upto(pdf.size - 1) do |i|
  puts pdf[i].get_text
end