How to change the Finder title bar font from the command line?
Got it. It's in ~/Library/Preferences/.GlobalPreferences.plist

Modify the following entry:

&lt;key&gt;NSTitleBarFontSize&lt;/key&gt;
&lt;integer&gt;11&lt;/integer&gt;


with your desired font size. This file actually contains a lot of your system's preferences, from your locale setting, to the antialias threshold, to the scrollbar behavior. The file is a binary plist, so you'll either have to use Xcode or convert it into XML and then back again using this method.