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Always check the return value from system calls like rename; you'd see that it failed. The readdir returns names of files in $dir but they're not prefixed with it so your rename("$name.$old","$name.$new") is trying to rename files in the directory you ran from not the one you named in $dir (you'd need to use "$dir/$name.$old" instead). You might also check out something like Path::Tiny for another interface which might be easier to work with. Edit: And just for clarity, by checking the return value I mean when you call things like opendir or rename that interact with the OS you should check their return value and print a meaningful error message when things go wrong. E.g.:
The cake is a lie. In reply to Re: Changing filename extensions
by Fletch
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