[librecat-dev] Sorting MARC records with Catmandu

[Uldis Bojars]

Thanks!

Note: the last command (conversion back to MARC) also has to have "--header
0"

I also needed to sort by multiple keys. Ended up writing a simple Python
script for the sorting step.

Uldis


On 14 September 2017 at 09:58, Patrick Hochstenbach <
Patrick.Hochstenbach at ugent.be> wrote:

> Hi
>
> There are many ways to do this. Basically the algoritm is:
>
>  * Extract the field you want to sort from MARC using marc_map
>  * Store the data somewhere (in memory, in a Catmandu::Store, …)
>  * Sort and export back to MARC
>
> You can do this on the command line also with the TSV exporter and
> to_json,from_json command to transform MARC into a line-by-record
> serialisation and sort this one using the UNIX ‘sort’ command. E.g.
>
>  catmandu convert MARC to TSV --header 0 --fix 'marc_map(245a,__sort);
> to_json(record)’  < camel.mrc \
>             | sort \
>             | catmandu convert TSV --fields '__sort,_id,record' to MARC
> --fix 'from_json(record)’
>
> Cheers
>
> Patrick
>
>
> > On 13 Sep 2017, at 16:25, Uldis Bojars <captsolo at gmail.com> wrote:
> >
> > Hi,
> >
> > Can Catmandu help with sorting a set of MARC records (by certain MARC
> fields / subfields)?
> >
> > Since records are normally processed sequentially and separately, it
> does not seem like a good fit. But perhaps you have some advice on how to
> do it.
> >
> > A quick-and-dirty non-Catmandu solution 'd be a custom script to load
> records into memory, to index / sort them by the required fields and to
> output them in this order.
> >
> > Thanks,
> > Uldis
> >
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