One Quickie

Building projects from the command line (Project Builder->General)
Look at xcodebuild. We've got a rant about cocoa development in emacs, which includes a discussion of pbxbuild, the predecessor to xcodebuild. Some of the arguments have changed over the years. I usually run it like:
% xcodebuild -configuration "Debug" -target "My Groovy App"
If you have one target, or have a default target, you can leave out the -target argument.

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Advanced Mac OS X Programming book