I had totally different experience with Facebook recruiter, honestly they are great and really want you to succeed. You could have just updated resume as UNIX/L

I had totally different experience with Facebook recruiter, honestly they are great and really want you to succeed. You could have just updated resume as UNIX/LINUX ...rest of the technical jargon should be explained to technical person in the interview. Why argue with recruiters? Get in the door as soon as possible and deal with someone who can understand the terms.