Hi, Not sure exactly which list of "classes available" you want, but if you wanted to know all the classes available to the interpreter to load, then you could conceivably iterate the directories in $:, the load path, and look at all .rb files in them and their subdirectories and parse them for the classes that they define. Bob On Nov 30, 2005, at 2:52 PM, Daniel Sche wrote: > Hello, > > topic says it all > for example irb knows many classes like Dir, File, Process, Thread .. > can I somehow list them, maybe the are kept in some array .. > if it's possible, can additional classes provided through > require "foo" > be listet too? > > I hope my question is clear > thanks in advance > > Regards, Daniel > >