Diff: obtain only the different lines of the newest file

Hello,



This is my first post in this mailing list. I hope there is a solution to my
doubt.

My question is about the diff command.

I have 2 files containing almost the same information with around 70.000
records.

What I would like to know is if there is a possibility to obtain only the
different lines from the second file without anything else.

I just need to know the content of the changed lines in the newest file.



Thank you in advance,
David