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If you already are comfortable with a programming editor, use that one. Just double-check with an instructor to make
sure it will work.

If you are unsure, we suggest [Sublime Text 2](http://www.sublimetext.com/2)

## 1. Open your Editor

### Windows

To start Sublime Text 2, please select it from the Start Menu under 'All

![Submlime Text 2](/img/installfest/sublime2.png?raw=true)

### OSX

1. Double-click the `Applications` folder in the disk image, or navigate to `Applications` in the left panel of
1. In `Applications`, scroll down until you see `Sublime Text 2`.
1. Double-click `Sublime Text 2` to open the editor.

### Linux

Type this in the Terminal to start Sublime:

Or, you can use your GUI's menus, as an icon has most likely been installed.

## 2. Set some basic preferences

Sublime Text 2 reads its preferences from text files. This means you can easily
edit settings, check your settings into version control, or share settings with
copy & paste. That's what we're going to do with some common preferences for

Open up User Settings (`Sublime Text 2 > Preferences > Settings - User`) and paste in these preferences:

  "tab_size": 2,
  "translate_tabs_to_spaces": true,
  "trim_trailing_white_space_on_save": true,
  "ensure_newline_at_eof_on_save": true,
  "save_on_focus_lost": true

Save the User Settings file (`File > Save`). Your new preferences are now in effect.

## Success!

Now you have an editor that you can use to open any text file, including Ruby programs.

## Next Step

You've got everything! Proceed to the [Checklist](/installfest/checklist).