Impossible.
Customer is synchronizing his archive with our ftp server and won't
rename files (already asked him :)) as there are too may of
them already.
Denis.
Or you could ask the customer to upload a small file called complete AFTER
the large file is uploaded and your script checks for the presence of this
small file then doesn't do anything until it exists. Once the processing is
complete the "completed" tag file is deleted ready for the next session.
Would this work?
Thanks everybody for help.