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add note about debug mode
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joshbuddy committed Mar 28, 2012
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include: [irb, ruby]

## Problems?

Things not going the way you'd like? Try your command again with NOEXEC_DEBUG=1 set and create a ticket. I'll fix it right away!

## How does this work?

It adds a script to every execution of ruby via the RUBYOPT environment variable. Then, when you run ruby, it takes a look at your working directory, and every directory above it until it can find a `Gemfile`. If the executable you're running is present in your Gemfile, it switches to using that `Gemfile` instead (via `Bundle.setup`).
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