Hi Tech Exams
Hoping you guys would give some pointers!

OK, so I've got an interview for a tech support job. It's at startup company (spun out from a university) that makes an API for social media. It's a development focused company (I'm not a dev.) The job is supporting end users (mainly developers but also Joe public) who use the API and/or pay for the results, and will be reporting to the devs and keeping the bug trackers up to date, as well as maintaining documentation, and so on...
Whilst I was in the phone interview we got talking about Linux, and it tweaked something, and he almost right away asked me for a full interview. When I spoke to the recruitment agency he said I should brush up on my linux (esp CentOS - my Fave and no doubt what they are using for hosting)
So peeps (i'm sure theres some PHP devs here) What aspects of Linux do you think I should look into revising before the interview?
Many Thanks

(and yes i have posted this elsewhere :P)