How to find the serial port number on Mac OS X?

You can find your Arduino via Terminal with

 ls /dev/tty.*

then you can read that serial port using the screen command, like this

screen /dev/tty.[yourSerialPortName] [yourBaudRate]

for example:

screen /dev/tty.usbserial-A6004byf 9600

Try this: ioreg -p IOUSB -l -b | grep -E "@|PortNum|USB Serial Number"

I was able to screen using the device's name anyway so that wasn't the issue. I was actually just trying to find the port number, i.e. 5331, 5332 etc. I managed to find this by a trial and error process using an app called TCP2Serial from the app store on Mac OS X. It isn't free but that's fine as long as I know it works!

Worth the 99c :) http://itunes.apple.com/us/app/tcp2serial/id506186902?mt=12