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$FG_HOME is an environment variable representing the path to where user-specific data is stored (not application data). Basically, it is a name for a directory that varies with the operating system and stores information between sessions: configuration/preferences, properties marked with the "user-archive" attribute, and aircraft-specific settings (using the data helper class in aircraft.nas).
- Mac OS X: ~/Library/Application Support/FlightGear
- Linux: ~/.fgfs/