A short script that can escape or unescape a list.

escape_unescape_urls.rb

#!/usr/bin/env ruby

require 'cgi'

CGI_METHODS = %w[escape unescape]
USAGE = "usage: #{File.basename(__FILE__)} input output type"

input = ARGV[0]
output = ARGV[1]
type = ARGV[2]

if !output || !input ||!File.exist?(input) || !CGI_METHODS.include?(type)
  $stderr.puts USAGE
  exit(1)
end

begin
  File.open(output, 'w') do |file|
    IO.readlines(input).each do |line|
      file.puts(CGI.send(type, line))
    end
  end
end