With the increasing popularity of server-side Javascript, you may want to have Javascript everywhere. You can use Javascript outside of a browser, on any platform. There are many choices: you can install Mozilla SpiderMonkey, Google V8 or Mozilla Rhino. If you are like me and use Mac OS-X as your development machine, however, you have hit a jackpot: OS-X Leopard and later come with Javascript CLI pre-installed. The CLI uses JavascriptCore by Apple, the same engine used in the Safari browser, and many other places all over OS-X.This is how you can enable JSC:

$ sudo ln -s /System/Library/Frameworks/JavaScriptCore.framework/Versions/Current/Resources/jsc /bin/jsc

via Command-Line Javascript CLI On Mac OS-X | Fresh Blurbs.

Tags: command-line | javascript | jsc