Unique enties of a specific partial column of csv file

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In a comma separated csv file,2nd column is 10 digit number(eg.7737480463). I am able to find out total number of unique entries for 2nd column by following command

awk -F, '{print $2}' abc.csv|sort|uniq|wc -l

But i want to find out total number of unique entries for 2nd column on the basis of first 5 digit(eg.77374).

asked 19 secs ago

user752590

79