That followed up from asking if they knew what Bash was. Is it wrong to expect them to know it's the shell and it's generally the default? I suppose my post must make me come across rather horrid, but I'm generally quite nice in interviews! :) It's not about looking stupid, I gladly take 'I don't know' or 'good question, I want to look that up' as an answer. It's embarrassing for everyone to ask what are generally easy questions on the topic that was on the CV and get a total blank stare.