I am going to assume you have installed Phantomjs and have created an alias in your .bashrc or have updated your system path to call the Phantomjs binaries. If not, you need to peruse a few beginner tutorials: http://net.tutsplus.com/tutorials/javascript-ajax/testing-javascript-with-phantomjs/
Once you have that set up, you will need to write a simple javascript file that you will call in the terminal (or shell, if you are using Windows). I will provide a simple, example script below.
var WebPage = require('webpage');
page = WebPage.create();
page.open('http://google.com');
page.onLoadFinished = function() {
page.render('googleScreenShot' + '.png');
phantom.exit();}
Then, save your js file. Open up your terminal or shell and run the following
phantomjs yourFile.js
That's it. Check the directory where you called the js file and you should have a png file with a screen shot of your web page.
This is very simple and there are a lot of caveats to f-ing with phantomjs, but this is about as basic as I can make it. If you need other recipes for phantomjs, try looking at these example scripts: https://github.com/ariya/phantomjs/wiki/Examples
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