Adding file extensions with metadata

[galactichull]

I'll attempt to be as clear as possible about my predicament.

Currently I have thousands of files with no extension.  They are named according to their hash.  Obviously with ExifTool I can generate a file that informs me of the extension.  That's helpful.

Is there a technique with ExifTool (or otherwise) to use the metadata to add in batch process the appropriate file extension to each file?  (I'd rather not do it one by one.)

Thank you for any help.

[Phil Harvey]

Things like this are easy:

exiftool "-filename<%f.$fileTypeExtension" DIR

And add -r to the command to recursively process subdirectories.

- Phil

[StarGeek]

Doesn't this also need an -ext *?

And when did you slip fileTypeExtension into the mix.  I can't keep up!

[Phil Harvey]

Doesn't this also need an -ext *?

Right.  Good point!

And when did you slip fileTypeExtension into the mix.  I can't keep up!

April 2015.   FileType was close, but not quite right for procedures like this.

- Phil

[galactichull]

Excellent.  I'll give this a shot. Thank you!