casperjs cli 是什么意思？

CasperJS ships with a built-in command line parser on top of PhantomJS’ parser, located in the cli module. It exposes passed arguments as positional ones and named options

1. Casper instance always contains a ready-to-use cli property for easy access to these parameters, so you don’t have to worry about manipulating the cli module parsing API.

Let’s consider this simple casper script:

var casper = require("casper").create();

casper.echo("Casper CLI passed args:");
require("utils").dump(casper.cli.args);

casper.echo("Casper CLI passed options:");
require("utils").dump(casper.cli.options);

casper.exit();

這是官網(wǎng)的文檔，沒(méi)明白這個(gè)casperjs的cli是什么意思？