[exim] Subtracting text files [OT]

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Autor: Marc Perkel
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A: exim-users
Assumpte: [exim] Subtracting text files [OT]
There's probably an easy way to do this.

I have 2 files. Both are sorted and unique. The first file has a list.
The second file has a list of things that should not be in the first
file. I want to generate a third that that has everything in the first
file except for what is listed in the second file.

How do I do that?

Thanks in advance