Bandit Level 8 → 9

Goal

In data.txt, find the only line that occurs once.

Why this matters

Frequency analysis is useful for finding anomalies, duplicates, and one-off records.

Progressive hints

1. Hint 1

   uniq compares adjacent lines only.

2. Hint 2

   Sort first so identical values become adjacent.

3. Hint 3

   Ask uniq to count or show only unique records.

Method

Run only the lines that match the evidence you observe.

sort data.txt | uniq -c
sort data.txt | uniq -u

Expected non-secret observation

The count view shows one record with frequency one; the unique-only view prints it directly.

Explanation

sort groups equal lines and uniq then measures or filters consecutive duplicates.

Troubleshooting

• Do not reverse the pipeline.
• Ensure the data is passed through stdin with the pipe operator.

Safety and cleanup

• Use only the OverTheWire game host and your own local practice directory.
• Do not paste a level password into this site, screenshots, notes, or submissions. Baitaphish never asks for credentials.
• Treat commands as learning prompts: inspect paths and flags before running them.

Completion and next step

Use the recovered credential only in the official Level 9 login. Then mark this transition complete and continue.