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Append lines from stdin to a file, but only if they don't already appear in the file. Outputs new lines to stdout too, making it a bit like a tee -a that removes duplicates.

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Password Cracking

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2026-10-10

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Password Cracking › Wordlist tools > Generation/Manipulation: “Append lines from stdin to a file, but only if they don't already appear in the file. Outputs new lines to stdout too, making it a bit like a tee -a that removes duplicates.”