SIGQUIT is the dump core signal. The terminal sends it to the foreground process when the user presses
ctrl-\. The default behavior is to terminate the process and dump core, but it can be caught or ignored. The intention is to provide a mechanism for the user to abort the process. You can look at SIGINT as "user-initiated happy termination" and SIGQUIT as "user-initiated unhappy termination."
$ sleep 100 ^\+ Done nohup sleep 100 Quit (core dumped)
But I can't find the dump file in the current directory. Where is it? Thanks.