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This question already has an answer here:

I want to get a list of bib-keys from my .bib file which I don't actually use in my document.

I have found "Unused bibliography entries - how to check which entries were not used?" but since I'm using biblatex I don't have the information in the .aux files, so I can't use checkcites.

Is there a biblatex way to get such a list?

marked as duplicate by Marco Daniel, Martin Schröder, Jesse, Peter Jansson, ChrisS Dec 20 '13 at 10:25

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    With biber, there is the option --output_format=bibtex, which will create a new .bib file of all the citations in the original .tex file. Easy enough to do a diff (or what have you) after that. Try: latex myfile.tex && biber --output_format=bibtex myfile.bcf which should create a file called myfile_biber.bib. – jon Dec 19 '13 at 16:14
  • This sounds great, but my version of biber doesn't have this feature (Unknown option: output_format). Which version do you use? – Scolytus Dec 19 '13 at 16:31
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    I'm using version 1.8 of biber, which claims that several options names have changed. I'd try biber --help to see if the option is available for your version under a different name. Or just upgrade your biblatex and biber (you'd need to do both, however). – jon Dec 19 '13 at 18:36
  • Alternatively, does this help you How to split bibliography into “works cited” and “works not cited”?? To use this you would have to modify your document though, but these changes are only minute and can be easily undone. – moewe Dec 19 '13 at 18:59
  • @jon There is an option --outformat=bbl|dot|bltxml, so it looks like it doesn't support .bib at all. I'm on 0.9.9, so pretty old. But thanks for your help! – Scolytus Dec 20 '13 at 8:39

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