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1. Objective-C Runtime environment variables

   Show help

   $ export OBJC_HELP=YES
   
   $ /Applications/TextEdit.app/Contents/MacOS/TextEdit
   (...)
   OBJC_HELP: describe available environment variables
   OBJC_PRINT_IMAGES: log image and library names as they are loaded
   OBJC_PRINT_LOAD_METHODS: log calls to class and category +load methods
   OBJC_PRINT_INITIALIZE_METHODS: log calls to class +initialize methods
   OBJC_PRINT_RESOLVED_METHODS: log methods created by +resolveClassMethod: and +resolveInstanceMethod:
   

   Log Objective-C messages

   $ export NSObjCMessageLoggingEnabled=YES
   
   $ /Applications/TextEdit.app/Contents/MacOS/TextEdit
   
   $ tail -f /tmp/msgSends-<pid>
   - NSLock NSLock lock
   + NSThread NSThread currentThread
   - NSThread NSObject hash
   - NSCFArray NSCFArray countByEnumeratingWithState:objects:count:
   - NSLock NSLock unlock
   - NSLock NSLock lock
   + NSThread NSThread currentThread
   - NSThread NSObject hash
   - NSCFArray NSCFArray countByEnumeratingWithState:objects:count:
   - NSLock NSLock unlock