Hi everybody. I've bought a MacBook a while ago, and it's my first time working on MAC OSX. The transition from PC was quite smooth, but still I have a few questions to ask you guys. 1) Do I need to install any anti-virus program on my system? Or even one of those programs that detects bad malicious cookies or scripts coming from the internet? 2) I noticed that Mac OS X (and later read) that it is very much based on UNIX, so it has a bash shell. I'm wondering if I can add Linux or Unix components to the shell, like put the commands in the bin directory. I'm a linux amateur, I don't know a lot about using it. 3) Is xcode enough for programming? I mean for C/C++ programming. I still haven't figured out how to work it correctly, but I still have to read someo of the documents and FAQs. Thanks in advance.