ftp: how to prevent access to file currently being accessed?

[Oliver Hardt]

hello: i really have not much knowledge about how ftp works, so forgive the question in case it was just too obvious.
problem: a file is kept on a ftp-server. this file is being accessed by n clients, and all clients will modify the file and upload it to the server.
question: how can i monitor from the client side whether the file is currently being used by another client, so that the it is not accessed until the currently accessing client finished uploading?

thank you! best, oliver hardt.
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