Multikey Cutter - cutting program MULTIKEY-bases

The program for cutting MULTIKEY-database by a particular column.

The input received txt and csv files.

For example, you can cut the base with such a structure:
Berdyansk; ERD; UA; Berdyansk; Berdyansk; Ukraine; Berdyansk, Berdyansk, from Berdyansk, Berdyansk; Berdjansk; Berdyansk, Ukraine, Ukraine; with Ukraine; Ukraine; 46.815000; 36.758056; +2.0; UKDB
Erfurt; ERF; DE; Erfurt; Erfurt; Germany; Erfurt, Erfurt, Erfurt, Erfurt; Jerfurt; Erfurt, Germany; in Germany, Germany, Germany; 50.979811; 10.958106; +1.0; EDDE
Mariscal Estigarribia; ESG; PY; Mariscal Estigarribia; Mariscal Estigarribia; Paraguay; Marechal Estigar, in Mariscal Estigare; from Marechal Estigara c Марискала-Эстигара;Mariskal-Jestigar;Марискал-Эстигар;Парагвай;в Paraguay, Paraguay, Paraguay; -22.044986; -60.621694; -3.0; SGME

on the individual files of the countries. Or files on the country code. Or any other column of the file.

Also, in a separate file result.txt saved links to the files.