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Thank u. This is exactly what I needed now.

HI,

I would like to know how to compare two files and replace non-matching lines with "_" .

I can get non-mathing lines with
grep -v -f file1 file2

i just want to knw how to display...

Hey Jim thanks for your reply. I could get matching lines between two files.
But I cant replace non-matching lines with "_" (under-score) in 'filex'. any help on this would be appreciated.

Hello everyone,
I would like to know how to compare two files and modify any differences with some other data using shell script.

I think it would be better understood with an example.

I got...