bellaire,
First, I believe your grep usage would need to be modified because as-is, the lines will be treated as regular expressions and not fixed strings. Second, I wonder how this would work if arbitrarily large files need to be supported. For instance, sort resolves this issue by using an on-disk divided and conquer strategy so assuming you have enough free filesystem, you can sort any size file. I just don't know how grep would do in this situation.

Cheers - L~R

In reply to Re^2: Filtering lines from one file from another by Limbic~Region
in thread Filtering lines from one file from another by antonn

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