Thank you for the links. I did a bit of reading to learn a bit and my understanding of the advisory file locking is that it can be ignored by programs that don'

Thank you for the links. I did a bit of reading to learn a bit and my understanding of the advisory file locking is that it can be ignored by programs that don't respect it. Is it fair to say that the the shell or gui the user used should have respected the advisory lock? Of course that's assuming the compression program used does attempt to apply file lock, which may not be the case according to another comment.