Gruntfile.js

//growlnotify -n "My App" -m "Hello world"
//osascript -e 'display notification "Lorem ipsum dolor sit amet" with title "Title"'
//os.platform`
var _notify = function(taskName, msg) {
    var _child;

    if (taskName == void(0) || taskName === null || taskName.length === 0) {
        if (this.name != void(0)) {
            taskName = this.name;
        } else {
            taskName = 'grunt';
        }
    }
    if (msg == void(0)) {
        msg = 'Task'+' `'+taskName+'`'+' done.';
    }

    msg = '\n'+msg; 

    _child = child.execFile('notify-send', ['-t', '1', 'Grunt message', msg], {}, function(e) {
        if (e) {
            console.log(e);
        }
    });
};