Can I use standard UNIX services, tools, and compilers on Mac OS X?
Yes. Mac OS X ships with a full BSD UNIX implementation, and all traditional UNIX tools and services are available. Compilers, such as gcc, and other development tools and utilities are available in the Mac OS X Developer Tools that ships on CD with Mac OS X retail packages, is preinstalled in /Applications/Installers in new Mac OS X systems, or is downloadable free from the Apple Developer Connection at http://connect.apple.com/.