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: boolean indicating if it is windows (SlimerJS only)

pid

Always returns 0 (no Mozilla API to retrieve the PID)

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()