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Your code may well be printing the message more than once, but the exec-ed call will be running in a different thread that will not have access to the console that outputs the first message; they will be totally separate processes.
Note though that it is not just going to print the message out twice, it is going to keep running and running, because each call spawns a new process. I am going to reboot my PC now to kill off the dozens of threads that are taking up 100% of my CPU
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Originally Posted by marlonmin
I think this code should print the message more than once, but it only prints once. What's the problem? Thanks.
Your subprocess is piping its output back to the main process. It isn't printed automatically; you have to do it yourself. Here's an example. For obvious reasons, I didn't retain your infinite-respawn cycle. You may need to change the exec() command string to something appropriate for your system if you're not on Linux. (Anything that generates output without reading input will do.)