How can I revive/move an "invisible" file into the directory?

I hadn't read the second half of your post, just the part I commented on.

I don't know if it's possible. I doubt there exists a portable solution, but I suspect Linux might have one.

In reply to Re^8: Bad file descriptor when trying to close file handle by ikegami
in thread Bad file descriptor when trying to close file handle by fireblood

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