Patrick O'Callaghan wrote:

> The upshot is that if a process has a file open, and that file is
> replaced by a different one (using unlink and creat) then the process
> will continue to use the old file and all its attributes. When the
> process closes the file, or terminates, the reference disappears and the
> system then recovers the space.

I make use of this when I save youtube movies. Flash deletes the file as soon 
as it is downloaded, but as long as the flash/nspluginwrapper processes are 
still running, the deleted file can be captured and copied to another location.

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