Looking for Born Again Shell Command Codes

Greetings all,

I cannot find the command to disconnect from a wifi network via terminal application. I need a born again shell code to dissconnect/reconnect to a network as if I alt-clicked on the wifi icon then clicked on 'disconnect from NETWORKNAME'. I need the airport to remain on but disconnect.

I'll save everyone the time of going into further detail surrounding this issue.

My comp overview:
Model Name: MacBook Pro 13 inch mid 2010 Mac OS 10.11.4
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 2
Memory: 8 GB
Graphics: NVIDIA GeForce 320M 256 MB

Thank you in advance for any help you can provide.

edit:typo

See http://www.cnet.com/news/how-to-adjust-network-settings-in-os-x-via-the-command-line/

To get your port's device name:
networksetup -listallhardwareports

Or did you mean something like this:
http://osxdaily.com/2011/04/12/connect-wireless-network-command-line/