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Did you consider the comm command with its selection parameters?


comm file[12]
1,A
2,B
3,C
4,E
8,K

Hello aaysa123,

Could you please try following and let me know if this helps you.

awk '{print $0 ORS "go"}' Input_file
OR
awk '{print $0}' ORS="\ngo\n" Input_file
Output will be as...

Thank you.

join requires sorted input, so isn't suitable here.

How about this:

$ awk -F, '{ A[$1]=A[$1] FS $2 ; T[$1]++ } END { for(X in T) if(T[X]>1) { print X A[X] } }' a.txt b.txt...