Spawn example

spawner.rb

pid1 = spawn "some_command"
pid2 = spawn "some_other_command"

pid1.on_exit do |status|
  puts "Process #1 exited with status code #{status}, aborting."
  exit
end

pid2.on_exit do |status|
  puts "Process #2 exited with status code #{status}, aborting."
  exit
end

Process.waitall