Ftp Access

I am creating a webcam site where users use a program to upload a picture to the site every minute or so. My problem is that I need to give them access to one directory and make sure they only have permission to read write and not to delete. How can I set this up?

Write permission is the same as delete. One way around this is to set up scripts that pick up an uploaded file and copy it to another directory that the user doesn’t have write access to.

Are you worried about accidental deletions, or a deliberate attempt by someone to delete a file they’ve uploaded?