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

Try this -

cat f
James Miki:123-456-7890
Wang Tai: 234-563-6879
James Miki: 123-456-7890
James Miki: 456-456-8888     ### added for test case
Wang Tai: 234-563-6879       ### added for test case
Vipin Kumar : 878-432-2345   ### added for test case
Vipin Kumar : 878-432-2345   ### added for test case

awk -F':' '{gsub(/ /,"",$2)}{b[$1FS$2]++} END {for(k in b) if(b[k]>1) {split(k,u,":"); print v,u[1],v FS u[2]}}' v='"' OFS=""  f
"Vipin Kumar ":878-432-2345
"Wang Tai":234-563-6879
"James Miki":123-456-7890

Explained -

gsub(/ /,"",$2): Remove space from 2nd column
b[$1FS$2]++    : Create array b and store col1 and 2 
if(b[k]>1)     : Check duplicate record
split(k,u,":") : split the stored value in k (combination of col1 and 2) so that we can add double quote on first column.