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FAQ: Listing Hierarchy

Is there an easy way to generate an indented listing of the complete Squeak hierarchical class structure?

Open up a "System Browser", select "Kernel-Objects", select class Object, pop up the class context menu and select "hierarchy". This will create exactly what you want. To get the list out to a file, you can use cut and paste.

Or, to do this all programmitically, the following should work:
(FileStream newFileNamed: 'hierarchySqueak.txt') nextPutAll: Object printHierarchy; close