title: How can I replace variable names across files?
body: <p>I am using atom as editor. I'd like to replace variable names across files. I've replaced <code>jpy_usd</code> by <code>usd_jpy</code>. I want to do that to all occurrences of <code>jpy_usd</code> in my rails project. Could you tell me if you know how to do it?</p>