Using CVS to update a file at time of commit

[robersonadam]

I am trying to use cvs to update the copyright date and information of java files when they are committed by developers. I know about the commitinfo file and have written a bash shell script to verigy the correct copy right is included. However I want to update the copy right date in the file automatically if the correct copyright is included. Has anyone ever done this?
I have a bash shell script that does this but need to know if a file can be modified before the commit occurs and how to execute the shell script to update the date.

Thanks

Adam