How to force a YAP program to quit?

I've been having problems forcing YAP programs to quit using SIGKILL on
Linux - that just seemed to create 2GB of garbage output before
exhausting the disk allocation ... Action (h for help): Action (h for
help): Action (h for help) ...

What approach do you recommend for programmatically forcing YAP
programs to quit? (YAP programs that are not being run interactively.)

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