- You need [`ffmpeg`](https://www.ffmpeg.org/) installed. If you have [Homebrew](http://brew.sh/) installed on a Mac, you can do this by running:

  ```
  brew install ffmpeg
  ```

- Put `process.sh` in directory containing `.ogg` files.
- Ensure it's executable:

  ```
  chmod +x process.sh
  ```

- Run it, to convert each `.ogg` file to a `.mp3` file:

  ```
  ./process.sh
  ```

- If a file is named `track.ogg`, the resulting `.mp3` file will be saved in the same directory as `track.mp3`.