coming from linux


Hi, I am a new mac user from slackware & archlinux, I am into programming(c,ruby,zsh)-network security theory. I understand there is a book for bsd/unix users migrating or wanting to learn mac os x which is based on darwin. The transitition shouldn't be too hard but coming from linux, it's different. Is there a book or webpage that can help me out? I can't really explain or ask this question on google.