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In IRB or console windows, tab completion does not work as it does in a shell window (at least on Unix/Mac). When using IRB or the Rails console in a shell, TAB will complete method names, etc. I find that I don't use the IRB/Console windows in NetBeans because their command line equivalents are more functional.
I saw this and figured I'd chime in.. I use tab completion, and to turn it on on some platforms I must use the following invocation : irb.exe --readline -r irb/completion I just checked and this seems to work fine in jirb fine as well.