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Renaming serial ports in unix

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http://www.unix.com – Hello everyone, this is my first post and I am by no means a unix expert, so I hope I explain my issue well. I'm on a mac (mac mini), 10.7. My question is about serial port names. I have an arduino microcontroller plugged in via usb, and every time the computer is shut down it gives the arduino a new auto-generated name (some variation of tty.usbmodem111 or tty.usbmodem121). The problem is that I am communicating with my arduino via firmata with an external program where I have set the correct serial port name by hand. So of course, whenever the computer restarts and then renames the (HowTos)