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Some recovered file names start with $$_

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I have recovered some files whose file names started with "$$_"filename. What are these files? What is the $$_ there for?

 

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I've no idea. Do you mean start with "$$_"filename, or $$_filename? Does the folder name give you a clue?

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From my very old experience of Unix (not used it for years).

In a Unix Bash shell $$ returns the Process ID of a running script .

I'm assuming that Recuva is using Unix or Linux to scan the disc, (many/most recovery tools do), and is using the process ID's to generate temporary filenames for whatever it has recovered.

EDIT.
Here's a bit more about these Unix special parameters that start with $ for anyone interested:
https://unix.stackexchange.com/questions/218270/which-are-bash-shell-special-parameters

 

 

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