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I did sort both the files and then tried diff as well as grep -v -f file1 file2, same problem.
It is running for too long.

I am trying stateful method, but I am not getting any output.
I made your code as a script file and executed it where the files reside, do not see anything,it comes back without any output or error....

grep -v -f file1 file2

Guess I got excited too early.
It worked fine for small files, but when I tried on large files (200+MB), it ran for 3 hours and still was running and I had to kill.
Appreciate for any other...

This is excellant stuff, this is exactly what I wanted. Thank you so much.

Hi, Thank you for the quick solution and looks pretty much what I want.
But I am unable to run this script, I use ksh.
One of the errors is "seq: command not found"

Yes, I want to exit the read loop when a match is found, I do not want to check any more for that line.
No I do not need the line number.

I have to compare two text files, very few of the lines in these files will have some difference in some column.
The files size is in GB.
Sample lines are as below:...