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Ooh, let me reply to my own discussion. Here is one of my all time fave "How do you ..." questions for an Eclipse IDE.
How do I show line numbers?
Select Window > Preferences > General > Editors > Text Editors and find the Show line numbers option.
Yep, it is five levels down, among a complex of settings panels devoted to managing editors (syntax coloring, line endings, etc. etc. etc.) Don't suffer hunting for the cheese. See if the Survival Guide gives you a clue.
If you are already familiar with an Eclipse IDE, you know what I'm talking about. It is a phenomenally powerful and flexible tool, but the side effect is it can be difficult to find what you're looking for.