Hello guys/gals,<br><br>I have a need to track changes to a file being made in real-time. So the entries in this file are MAC addresses of clients that can get added/deleted, sometimes multiple entries per second. What I want to do is to see all the changes were from time A to time B. 
<br><br>I thought about tail -f, but that only lists the entries being added. Doing diff would require copying the file and running diff against it every second or so, and then again it wouldn&#39;t necessarily list all the changes, just the one between the last changed file and the current one.
<br><br>I hope I&#39;m explaining this clearly, but basically the question is, is there a utility in Linux/Unix world which can track any changes being made to a file in real-time and list/track/put-in-a-file those changes being made?
<br><br>Many thanks for any help you can provide.<br><br>Regards,<br>Faisal<br>