Thanks Joseph.  I *really* appreciate tips like this.
Tremendously helpful!

---------------------
Joseph Sinclair wrote:
> I assume what you really want is to ignore all comment lines completely
> (not just changes to comment lines).
> Diff won't do this directly, but that's what [named] pipes are for :)
>
> try this:
> diff <(grep -v '^//' file1) <(grep -v '^//' file2)



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