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Thanks for your reply. The problem is also to remove Numbers from File1 that are present in File2. It's not only comparing.

Hi guys, I have 2 Files filled with numbers on each line: f1.txt and f2.txt I just want to keep in f1.txt numbers that are not in f2.txt. If Number1 in f1.txt is not in f2.txt then keep it else remove it from f1.txt