Diff two address lists?

[William Scott Lockwood III]

On Jul 27, 2012 10:09 PM, "Patton" <p.echols at comcast.net> wrote:
>
> I have a need to compare two lists of email addresses.  Each one is a
text file with address per line.  What I need to output is a list of email
addresses that are only in list B, I do not want the addresses that are in
both or are only in A.
>
> I've read man diff, and it looks like I should be able to do it, but I
cannot figure out how to do it and clearly do not understand some of how it
should work.
>
> I am not married to using diff, anything that will get the result will be
great.  Any thoughts??
>
>
> --
> Patton

I would run both files through sort, which will ensure the order is the
same in both files, and then diff -u them both.
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