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That depends how you “try to close the program”. Top/htop/btop often SIGKILL by default. As for closing it legitimately, it depends on your WM and xorg vs wayland. On my DWM setup, I have a keybind for a graceful shutdown and one for SIGKILL.
Yes, I intentionally didn’t want to provide too many details, as I thought it would just be confusing for someone who doesn’t already have a lot of background knowledge on the subject.
But specifically, I was talking about command line programs and ending them with Ctrl-C