rake command looks for Rakefile up the directory chain?

I am using Rails3 and accidentally I ran rake command from within lib directory. rake command suc开发者_如何学编程cessfully ran. I think rake command looks for Rakefile all the up the chain. Is that true?

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Yes. According to http://docs.rubyrake.org/user_guide/chapter02.html you can avoid that by:

rake -N