grunt cli exec use stdout.js

exec: {

	//get IP & Set a local variable
	get_ip: {
		command: 'ifconfig | grep -m 1 "inet addr:192.168.1" | cut -c21-31',
		callback: function (error, stdout, stderr) {
			if (error !== null) {
				grunt.log.error('exec error: ' + error);
			};
			globalConfig.myIP = stdout;
			console.log('set myIP:', globalConfig.myIP);
		},
		stdout: false,
		stderr: false

	}