Issues with setting up appium on OS 10.10

I am using OS 10.10, with appium 1.4.8 to test automate safari on iphone 6 (OS 8.1.3).

Command "ios_webkit_debug_proxy -d -c Your Device's UDID:27753" doesn't accept device UDID.

Can someone help with exact syntax of ios_webkit_debug_proxy command.

Is there a specific location from where this command should be run.

Any advice or insight will be of great help.

Thanks!