API Reference System

This is a living document. As the codebase is updated, we hope to keep this document updated as well. Unless otherwise stated, this document currently applies to the latest PhantomJS release: PhantomJS 1.8.0

Note: This page serves as a reference. To learn step-by-step on how to use PhantomJS, please refer to the Quick Start guide.

## Module: System ## A set of functions to access system-level functionality, modeled after the [CommonJS System proposal](http://wiki.commonjs.org/wiki/System). This also includes process-related properties.

To start using, you must require a reference to the system module:

var system = require('system');

### Properties ### #### `pid` {Number} #### **Introduced:** PhantomJS 1.8 Read-only. The PID (Process ID) for the currently executing PhantomJS process. #### `platform` {String} #### Read-only. The name of the platform, for which the value is always `'phantomjs'`. #### `os` {Object} #### Read-only. An object providing information about the operating system, including `architecture`, `name`, and `version`. For example: ```js var os = require('system').os; console.log(os.architecture); // '32bit' console.log(os.name); // 'windows' console.log(os.version); // '7' ``` #### `env` {Object} #### Queries and returns a list of key-value pairs representing the environment variables.

The following example demonstrates the same functionality as the Unix printenv utility or the Windows set command:

var env = require('system').env;
Object.keys(env).forEach(function(key) {
    console.log(key + '=' + env[key]);
});

#### `args` {String[]} #### Queries and returns a list of the command-line arguments. The first one is always the script name, which is then followed by the subsequent arguments.

The following example prints all of the command-line arguments:

var args = require('system').args;
if (args.length === 1) {
    console.log('Try to pass some arguments when invoking this script!');
}
else {
    args.forEach(function(arg, i) {
        console.log(i + ': ' + arg);
    });
}