Add double quotation on duplicated name

Question

I want to find duplicated name from the file like below and marked them with \"\".

file:

James Miki:123-456-7890
Wang Tai:  234-563-6879
James Miki: 123-         


        

Answer 1

sed 's/: */:/' FILE | awk -F: '{ if (arr[$1":"$2]) print "\""$1"\":"$2; else { arr[$1":"$2]++; print $0 }}'