Second script, restarting main script

[Fred]

How can I run a second script, which restarts my main program if got a critical error and stops working? Or just restarting the program every n seconds regardless if it is running or stopped responding?
As I understood, I cant do it in one program, because if it stops, it will not be able to restart itself.

[Marcus Tettmar]

Well if you compile your script to a .exe you could have a second .exe kill the process of the first, and restart it. Easy to do every n seconds, but if you want to detect it being stuck that depends what makes it look stuck as to what you can detect.