Okay. You know all those byhost pref files? Well I want to create copies of all of them for all the machine in my lab so that I don't have to replicate the prefs manually every time I clone new systems. I also have text file with the MAC addresses of all the machines in the lab. So, I am trying to find a single command that would duplicate the files and replace the MAC address with one from the text file, until there are copies for every machine. Thanks.