I opted for the following placed in the .bash_profile in user home directory...
chown -R yp /home/Shared/*
chgrp -R users /home/Shared/*
chmod -R 660 /home/Shared
This sets the owner status of the files in this directory as YP which is a group everyone belongs to.
Also the group is set to "user"s which everyone belongs to.
However this works fine except one thing.
Some people can save files to the shared folder which other people cannot change the privelgies for.
For example I can log on as admin. This is an account which I use to adminsiter the computer. If I save a file into the shared folder during this session and log out it stays as having "admin "for owner and "admin" for group.
If some one else log in for example the "yp" account. When the script is run files cannot be changed as their is insufficent priveliges.
I think that the above script would be best run as root user which would solve the problem
I also tried putting the above inside the .bash_logout file which would solve the problem but this didn't work.
Thank in advance!