how to filter this file? any software?

walker

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I have a file A, say has 1000 lines, each line is a url. another file B, has 600 lines, each line is a url. now, I want to filter all urls in file B that are already in file A, so, in file B, it only has lines that are not in file A.

any simple way to do this? software?

thanks
 
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