pid1 = fork do
  pid1_output = `ruby scrape1.rb`
  puts "#{pid1_output}"
  puts ""
  exit
end

pid2 = fork do
  pid2_output = `ruby scrape2.rb`
  puts "#{pid2_output}"
  puts ""
  exit
end

pid3 = fork do
  pid3_output = `ruby scrape3.rb`
  puts "#{pid3_output}"
  puts ""
  exit
end

pid4 = fork do
  pid4_output = `ruby scrape4.rb`
  puts "#{pid4_output}"
  puts ""
  exit
end

Process.waitall

fork do
  exec("ruby scrape1.rb")
end

fork do
  exec("ruby scrape2.rb")
end

fork do
  exec("ruby scrape3.rb")
end

fork do
  exec("ruby scrape4.rb")
end

Process.waitall