We use a programmatic assessment of Linux skills in our hiring process. I'm not thrilled with such assessments, but they do give a good foundation to talk over in the tech interview.

There's this one question that _everyone_ gets wrong, but only on a technicality. They figure out how to find the answer, but they always copy-paste the full contents of the proc 'file' which contains all the possible settings with marks around the currently selected one. The grader want's just the selected value.

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@CarlCravens

One of my jobs I taught the interviewer new things about bash/linux (he was the lead java dev, I was interviewing for sysadmin.)

I've also had interviewees teach me new things about bash/linux.

I've had a couple of automated type assessments but never been super happy with the inflexible nature of the results they want.

@dcbaok The inflexible nature is why I
1) use it to establish a baseline of knowledge and the beginning of a conversation; never as a screen that disqualifies someone
2) took the assessment myself and seek to understand the sticking points and why people give the answers they do.

I'm interviewing for near entry-level, and it's a poor use of time to explore "do you understand chmod" in a live interview.

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