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Reverse-engineer a book file format to search it

After the RAG indexer crashed on an uploaded book, Claude used Unix commands to work out the file format and grep the book manually.

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Use case overview

After the RAG indexer crashed on an uploaded book, Claude used Unix commands to work out the file format and grep the book manually.

Reported experience

  1. What they did

    The commenter uploaded a book into the project context on Claude's web chat. The RAG indexer crashed on the file. Claude then used a series of Unix commands to work out the book's file format, and searched the contents with grep by hand. The source doesn't say whether the commenter prompted any of these steps.

  2. How it went

    Claude got around the crashed indexer and could search the book anyway. The commenter found this surprising. The source gives no details on accuracy, the file format, or how long it took.

Example prompts

Try with Claude Code
I have a file at [path to file] that my tools can't read properly, and it is a [book/document, format if known]. Use command-line tools to inspect its structure, work out the format, and extract the readable text into a plain text file. Then search it for [topic or phrase] and show me the matching passages with their locations. Don't modify the original file.
Sales · Beginner
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  2. Fetch company site
  3. Claude scores fit

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Customer Support · Intermediate
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  2. Claude classifies
  3. Draft from help docs

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Coding · Intermediate
  1. PR opened
  2. Copilot inline review
  3. Claude risk summary

Automated first-pass review on every pull request

Copilot and Claude review each PR for bugs, missing tests and risky changes before a human looks, so reviewers can focus on design.

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