awk + How do I find duplicates in a column?

Question

How do I find duplicates in a column?

$ head countries_lat_long_int_code3.csv | cat -n
     1  country,latitude,longitude,name,code
     2  AD,42.546245,1.601554         


        

Answer 1

If you just want to print out a unique value that repeat over the same file just add at the end of the awk:

awk ... ... | sort | uniq -u

That will print the unique values only on alphabetic order