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Practical guide to Bash security: explains why tiny shell mistakes escalate, then walks through five common pitfalls—unquoted variables, eval-based injection, insecure /tmp files, PATH hijacking, and secret leaks—each with safer snippets, guardrails (set -euo pipefail, strict IFS, mktemp, known PATH), and ShellCheck install/use tips, distro-specific install commands, plus a CTA to harden real scripts.