Hi Marshall!

Thank you so much for your detailed response and guidance. I am a newbe in Perl and I got a bit lost with my attempt using as you say advanced options, so I really appreciate your comments. I agree that using the "glob" is easier and much more clear to me in this specific case.

I decided to go with the ST code since I have 16000 files with approx. 4000 arrays each. So based on your guidance this would be the faster way.

Most importantly, the ST script you have suggested works perfectly! I have just tried it on all the files and it was done in less than 5 minutes. Later on I will test and compare both scripts. With ST script you have suggested I got the desired result and I cannot thank you enough.

It is always nice to see someone ready to share his knowledge with the world and it is a motivation for the rest of us to do the same!

Cheers!