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Thanks a lot !!! It worked .. Btw could you explain why i need to put in Quotes ???

I would want to redirect this output to file also .
printf( "%s old=\"%s\" new=\"%s\"\n", $2, $3, new[$2] )

Currently i'm getting an error like :

awk:cmd line:11 (filename=input.txt FNR=4)...

What if i'm readin the diff ouput from a file ?

The o/p printed is the result of the diff operation .

i need to print old values and new values of abc , xyz etc using that result . how do i do that

I have a file containing the below data obtained after running a diff command

> abc 10
< abc 15
> xyz 02
<xyz 05

.....

Does anyone know how i can obtain output like :
...