Changing local IP address with networksetup command on OSX?
The command to manually set an IP address is:

networksetup -setmanual Ethernet 192.168.0.6 255.255.255.0 192.168.0.1


This assumes the following:


netmask is  a /24 (254 hosts)
the router/gateway is the "common" 192.168.0.1
Your interface is Ethernet


You will need to adjust your settings accordingly.  To get a list of network services (interfaces), you can issue the command:

networksetup -listallnetworkservices