Richards-MacBook-Pro:~ richard$ avrdude -p m328p -c avrisp -v -P USB
 
avrdude: Version 5.11.1, compiled on Feb 16 2012 at 22:11:20
         Copyright (c) 2000-2005 Brian Dean, http://w...content-available-to-author-only...o.com/
         Copyright (c) 2007-2009 Joerg Wunsch
 
         System wide configuration file is "/usr/local/CrossPack-AVR-20120217/etc/avrdude.conf"
         User configuration file is "/Users/richard/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping
 
         Using Port                    : USB
         Using Programmer              : avrisp
avrdude: ser_open(): can't open device "USB": No such file or directory
 
avrdude done.  Thank you.
 

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