My apologies if I am not understanding what you're saying. My question in this thread may not be very well worded.

I am able to see if all host-aliases that exist in file1 also exist in file2. The problem that I now face is that I need to know if the host-alias exists under the same "host id" in both files.

So, if host-alias www.foo.com exists under "host id" bobjones in file1, it also must exist under bobjones in file2. I hope that makes sense :)

In reply to Re^2: Difficulty Mapping Data by walkingthecow
in thread Difficulty Mapping Data by walkingthecow

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