One Quickie

Seeing entitlement and certification information (Provisioning Hell->Hacks)
Sometimes it's useful to see what certificate was used for signing, and what entitlements are in your app. The codesign tool does that. How to use:
% cd ~/Library/Developer/Xcode/Archives/$DATE/Campwhere.xcarchive/Products/Applications
% codesign -dvvv ./
% codesign -d --entitlements - ./

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Advanced Mac OS X Programming book