Hi, I'm in software developement field since many years, contributed on many software successfully. But now i realize that i have to some certification led courses. My new project is on AIX Linux based that's why i want Linux certification. Red had led certification or comptia Linux+. All are vendor neutral certification. Even going forward on this way i downloaded ucertify free questions, almost 15 questions i solved and especially study notes helped me in this regard. i think i can pass the exam but now i have to buy the test papers, books, study guides etc. Good luck!