Nice thing to use when working with CSV-files is CSV Kit.
See the file statistics: csvstat -e UTF-16 test.csv
Merge all files in a folder: csvstack -e UTF-16 -t *.csv > all.csv
Save column 2 to output .csv: csvcut -c 2 -e UTF-8 all.csv > output.csv
Remove duplicates:
Sort the file first: sort -n output.csv > sorted.csv
Save only unique values: uniq -u sorted.csv > unique.csv
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Written recommendations from Trafik og Veje, Aarhus Municipality (2011) and AgroTech (2010).
