[betadreamer]

This happens all the time. Recruiters are Sales people. They don't want to learn technical things. It's not in their interest to know what Unix is. They just want to validate whether you are good and if so, sale you the position.

The proper response here is: "I have experience in Linux and Unix. Updated resume is attached." Done.

You need to treat them like he's your old uncle. Use minimal technical words, repeat what they ask/say and most importantly respect them.