Re^2: rename file

[haukex]

If this is all happening on the same file system, then it's an atomic rename (fully done or not at all).

It's not quite that simple. While rename(2) is supposed to be atomic on POSIXish systems, there are several of corner cases where that isn't completely reliable (e.g. NFS). One really has to know what OS and filesystem one is working on.

[perlfan]

Thank you for clarifying this point, I almost mentioned NFS. OP didn't seem quite ready for a lesson of file systems, but I did want to relate it to what might actually be happening since they were thinking the operations were extension or file type aware. I also assumed they were coming from a more vulgar environment, like Windows (but used unix commands to illustrate the point nonetheless). That and using old skool CGI from 1990 seem to go hand in glove