Installing Rhino on Mac

February 20th, 2009. Tagged: JavaScript, mac, tools

To quote

Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

Rhino allows you to use JavaScript:

  • on the server-side, so you can ditch RoR, Perl, PH... well, keep PHP 🙂 ... in favor of JavaScript
  • on the command line, so you can shell scripts

Let's see how you can install Rhino on OSX.

Step 1 - download and unzip

Download the binary from the Rhino site and unzip to a temporary directory, say /tmp. On the command-line:

$ curl > /tmp/
$ cd /tmp
$ unzip

Now you have the file /tmp/rhino1_7R1/js.jar

Step 2: move js.jar where Java can find it

Your default Java install (comes "free" with OSX) will look for class libraries in a predefined directory ~/Library/Java/Extensions. This directory may not exists, so create it and move the js.jar there.

$ mkdir ~/Library/Java
$ mkdir ~/Library/Java/Extensions
$ mv /tmp/rhino1_7R1/js.jar ~/Library/Java/Extensions/

Step 3: Done! Now test it

That's all there is, your Rhino install is ready to use. To launch and test the Rhino shell try:

$ java
Rhino 1.7 release 1 2008 03 06
js> print('hello!')
js> parseInt('123abc')
js> encodeURI('hola LA!')
js> for (var i = 0; i < 5; i++)
  > print('i is now ' + i)
i is now 0
i is now 1
i is now 2
i is now 3
i is now 4
js> quit()

Last example - create a script that reads the HTML source of my blog:

$ echo "print(readUrl(''))" > read.js

now you have a script called read.js, let's run it:

$ java read.js

Thanks for reading!

And happy JS-scripting!

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