cvs-update triggers

[paul . payton]

hello,
i would like to setup a trigger for when cvs-update touches a file (updates or 
merges) in checked out work areas.  is there already a mechanism for this? i 
want it to run a script or set of commands
my specific need is that i want to have a shell-rc file in the repository, when 
someone makes changes to it and then i do an update, i get those changes and 
therefore would like to re-source that file and update my shell.  is this 
possible to set-up?
thanks
paul