What first got you using UNIX or UNIX-type OS? I know for me I got interested in computer hacking when I was about 14 years old. The first thing any basic hacking tutorial will tell you is to use Linux (or BSD) and start programming, which I did. My first Linux was Red Hat 7.0 I believe. Shortly after I bought my first FreeBSD from CompUSA which came packaged with a big FreeBSD reference book, in the Walnut Creek days. It took a lot of frustration and trial and error but eventually I got used to UNIX and have not looked back since.