rterrell$ /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/Resources/jsc
  >>> for (var i=0; i<10; i++) { print("Hello World!", i); }
  Hello World! 0
  Hello World! 1
  Hello World! 2
  Hello World! 3
  Hello World! 4
  Hello World! 5
  Hello World! 6
  Hello World! 7
  Hello World! 8
  Hello World! 9
  undefined
  >>>

* [JXA Cookbook](https://github.com/JXA-Cookbook/JXA-Cookbook)

* [JavaScript OS X App Examples](https://github.com/tylergaw/js-osx-app-examples)

For my application (URL in bio), I wrote a shell script that (mostly) automatically generates the screenshots for the Mac App Store. It uses osascript(1) with some JS to set the system colors/wallpaper/language to a particular style, position the app window where I want it, take a screenshot, block out my menubar extras, crop it to the requested size, etc.

OSA scripting is actually pretty powerful, but sadly the documentation is awful. Try:

  osascript -l JavaScript -e 'Application("System Events").appearancePreferences.appearance = "graphite"'

[1]: https://en.wikipedia.org/wiki/AppleScript#JavaScript_for_Aut...