How to run Terminal commands in Xcode?

Anyone knows how to include Terminal commands ( like sudo) in Xcode?  for example in a line of my program I need to run this:
sudo open/Library/Preferences/com.apple.sharing.firewall.plist
I searched the library but found no class or routine for that.

Well, I am not a professional programmer, but one of the things I continue to learn is how to wade through all of the Cocoa documentation (and it does get deep in spots).  Chances are though, no matter what you are trying to do, Apple or some third party has created a class to make it easier - you just have to find it.  My Xcode documentation bookmarks continue to grow, but you might start with some of Apple's documentation, such as
Cocoa Fundamentals Guide
Foundation Framework Reference
Application Kit Framework Reference

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