[NTLUG:Discuss] Filtering a list with a list

[Daniel Hauck]

I have a process that generates a list of valid email addresses for a
system.  I would like to be able to filter that list by removing all
entries that appear in an exclusion list.

For example:

======================
Source list:

user1 at domain.com
user2 at domain.com
root at domain.com
uucp at domain.com
user3 at domain.com
user4 at domain.com

======================
Exclude list:

root at domain.com
uucp at domain.com

======================
Filtered results:

user1 at domain.com
user2 at domain.com
user3 at domain.com
user4 at domain.com

======================

So the question is, what tool(s) do I use to do this?  I'm guessing
there is a simple way to do it. I just don't know what it is.