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I want to think that’s a terrible question - checking whether they have the signal table memorized is a hilariously bad way of trying to assess someone’s fitness as an engineer.

On the other hand, there’s some signal (sorry) on the nature of the work you’re doing in whether SIGTERM (15) is imprinted in your brain from near-daily appearance on your screen, or not.

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Yeah, the only reason I can remember SIGKILL (9) is because of kill -9.

I don't think so, unless you are referring to some kind of atypical terminal work. I just tried killing a console program and I see "Terminated: 15". That's not a line I even recognise - it's not common or important enough to bring to my attention.

I would say a vital command-line skill is having a good filter to ignore what's irrelevant.

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