system

System is a module to retrieve some system informations.

var system = require('system')

args

An array containing a list of arguments on the command line given to the script. The first one (at index 0) is always the script name.

var numberOfArg = system.args.length;
var thirdArgument = system.args[2];

os

An object having information about the operating system. Here are its properties:

• system.os.name: the name of the operating system
• system.os.architecture: its architecture : 32bit, 64bit...
• system.os.version: its version
• system.os.isWindows(): a function returning a boolean indicating if it is windows (SlimerJS only)

pid

Contains the id of the Gecko system process.

platform

Returns "slimerjs".

env

An object containing values of all environment variable.

var myHome = system.env['HOME'];

standarderr

Same as stderr.

standardin

Same as stdin.

standardout

Same as stdout.

stdout

The standard output stream. This is an object with the same API as a file (/dev/stdout on MacOs and Linux) opened with the mode “w” with encoding set by phantom.outputEncoding (UTF-8 by default) or --output-encoding.

• system.stdout.write('something')

You can output binary content (for chained commands for example).

// myscript.js

phantom.outputEncoding = 'binary';

var page = require('webpage').create();
page.viewportSize = { width:600, height:800 };
page.open(url, function(success) {
    if (success == "success") {
        let bytes = page.renderBytes({format:'png'})
        if (bytes) {
            system.stdout.write(bytes);
            phantom.exit(0);
        }
    }
    phantom.exit(1);
})

And on the command line:

slimerjs myscripts.js > image.png
slimerjs myscripts.js | convert - test.jpg

Note: binary output is not really supported on Windows.

stderr

The standard error stream. Same behavior of stdout but on /dev/stderr.

On windows, it is the output stream.

• system.stderr.write('something')

stdin

The standard input stream. This is an object with the same API as a file opened with the mode “rb” with no encoding.

It is not available on Windows.

var input = system.stdin.read()