I have over a million unique ids in (posts_ids.txt) each line by line.. I have a new file called (newposts_ids.txt) that has over 50 thousand ids each line by line too.. If I combine both files and remove dups then I wont be able to know which ones are the new ids.. so Is there anything that can scan the (newposts_ids.txt) and remove dups regarding to the (post_ids.txt) file?
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