Thank you very much for the suggestion Jan but for some reason the Date-Added
field is empty in my merged .bib file, while the Date-Modified field doesn’t
allow me to distinguish entries from the two separate source files.
> On Jul 22, 2018, at 1:26 PM, Jan David Hauck <jan.d.ha...@ucla.edu> wrote:
>
> BibDesk actually does store information on the date a bibtex reference was
> first added.
> If you right-click on the columns in the main window (or two-finger
> tap/click, depending on your settings) and select "Add Other ..." you can add
> the Columns Date-Added and Date-Modified. Clicking on them then sorts your
> entries accordingly.
>
> If you open your .bib file in a text editor you also see these fields for
> every entry.
>
>
>
> On Sun, Jul 22, 2018 at 10:50 AM, John Clegg <jjcl...@gmail.com
> <mailto:jjcl...@gmail.com>> wrote:
> Dear all,
>
> Sorry to barge in on this list, but I’m quite desperate as I have only a few
> days to submit my dissertation and I am at a loss about how to solve a .bib
> file management problem.
>
> My problem is that at some point in the past I merged two large bibliography
> files and I now need to unmerge them. Specifically I need to delete all
> references that came from one of the two original files.
>
> Because BibDesk does not appear to store information on the date a bibtex
> reference was first added, the only way that I can identify which reference
> is from which original file is from the citekey. In one of the files all the
> citekeys were constructed with full colons and in the other none of them
> were, so if I can search the citekey field for a full colon I can select all
> the references from one original file and not the other. However the Smart
> Group feature does not currently allow me to match by citekey. Would it be
> possible to do this using a “Script Group”? Unfortunately I do not have any
> experience writing scripts and I haven’t found any help documentation on this
> BibDesk feature.
>
> Since I still have one of the original .bib files from which this merged .bib
> file was created I presume I could also do the unmerge by identifying and
> removing duplicates between the merged file and original file. However I
> cannot see a feature for this in BibDesk and I’m not familiar with the
> command line tools that I presume would be necessary for this.
>
> Can anyone help me out?
>
> Best,
> John
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