require "posix"

print ("parent: my pid is: " .. posix.getpid ("pid"))

local pid = posix.fork ()

if pid == -1 then

  print ("parent: The fork failed.")

elseif pid == 0 then

  print ("child: Hello World! I am pid: " .. posix.getpid ("pid"))

  print ("child: I'll sleep for 1 second ... ")

  posix.sleep (1)

  print ("child: Good bye");

else

  print ("parent: While the child sleeps, I'm still running.")

  print ("parent: waiting for child (pid:" .. pid .. ") to die...")

  posix.wait (pid)

  print ("parent: child died, but I'm still alive.")

  print ("parent: Good bye")

end