I followed these instructions (except for copying the executable to my PATH because I cannot seem to find it and it does not seem necessary). Then I made a file called image_render.js in my public javascripts directory with
console.log('Hello, world!');
phantom.exit();
inside it, saved it, and ran phantomjs render_image.js in my terminal.
However, my terminal does not recognize the command:
-bash: phantomjs: command not found
What have I done wrong?