Can't seem to save the output of a client.shell() command to a variable

Question

I am using node-webkit and ADBkit to attempt to read a line from an android build.prop and do something depending on what that line is.

full script at http://pastebin.com/7N7t1akk

The gist of it is this:

var model = client.shell(devices, "su -c 'grep ro.product.model /system/build.prop'" );  
alert(model)

i want to read ro.product.model from build.prop into the variable model
As a test im simply attempting to create an alert that displays the return of this shell command, in my case ro.product.model=KFSOWI but whenever i run this script with a connected device the alert returns object Object

edit** Ive just realized that client.getProperties(serial[, callback]) would probably work better but dont understand these functions (specifically callback) very well

I am very new to this area of Javascripting and home someone can offer some insight

Answer 1

JavaScript is asynchronous programming language, it is built on callbacks. Every function should have callback with data passed to it, if you will watch on documentation, you have client.shell(serial, command[, callback]) so data from executing client.shell() will be passed to callback. You should assign some function that will process callback, for your case will be this

client.shell(devices, "su -c 'grep ro.product.model /system/build.prop'", function(data) {
    console.log(data);
});

P.S. there is no alert in nodejs