Thanks a million for the quick reply. I'll give it a bash. I'll go get a book and educate myself on using Terminal.

Funny that I am quite competent with the DOS Prompt in Windows and often write complex batch files but if I thought I could migrate my knowledge intuitively to Terminal, I couldn't have been more mistaken. I'll correct this oversight.

Looking at some of the other posts with references to excel etc. I suppose it is possible to write a series of tags to be loaded into an external file and have the program loop through a series of files and update them. However, I need to learn the basics first.

Thanks again, the hints were particularly useful