Safely renaming a file without overwriting

[Wolfgang Draxinger]

Diez B. Roggisch wrote:

> The link/unlink trick of Chetan sounds reasonable, though.

It will work only if both source and destination are on the same
file system, which means you can't move a file between mount
points - at least that's the way how it's defined by POSIX; NTFS
supports hard links and soft links, too but I don't know if
those got the same constraints.

Wolfgang Draxinger
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