title: Replace string in multiple files recursively
body: <p>I have multiple files named <code>dev.rc</code> in a very huge folder structure. These files are containing environment variables, like:</p>
  
  <pre><code>...
  FOO=bar
  ...
  </code></pre>
  
  <p>I want to replace bar string along all the project with the string <code>baz</code></p>
  
  <p>I tried to pipe some bash commands like: <code>find</code> and <code>sed</code> but I cannot save the content of the replaced string in the original file.</p>