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Learn to build a private, terminal-first RAG assistant on Linux that answers questions from your own PDFs, notes, and wikis without the cloud. The guide installs prerequisites and Ollama, ingests docs to text via Bash, embeds with sentence-transformers, indexes with FAISS, and queries a local LLM. It includes scripts (ingest.sh, build_index.py, ask.py), tuning tips, real-world uses, and troubleshooting.