Linux

**Judgment:** This skill is a strong, experience-driven reference for Linux “gotchas,” particularly useful for admins and DevOps engineers who already know the basics and want to avoid real-world traps. **Strengths:** - Covers many critical pain points: permissions, processes, filesystems, disk space quirks, networking, SSH, systemd, cron, and memory/OOM. - Focuses on scenarios that commonly cause outages or data loss (e.g., kill -9, rm -rf, SSH permission issues, cron PATH). - Content is concise and practical, well-suited as a quick checklist during real operations. **Risks / Limitations:** - Some statements are simplified and may not capture distro/version-specific nuances (e.g., exact behavior of chown with symlinks, setuid on scripts on nonstandard setups). - Not a step-by-step tutorial; assumes the user already understands basic Linux commands and concepts. - Lacks explicit caveats for potentially dangerous commands (e.g., tune2fs, rm -rf) beyond brief warnings, so inexperienced users could still misuse them. **Recommended Scenarios:** - Teams running production Linux servers who want to reduce human-error incidents from common admin mistakes. - Intermediate to advanced users who need a compact reminder of subtle behaviors before performing risky operations. - On-call engineers who must quickly recall where Linux behavior can be misleading (disk usage, memory reporting, cron/systemd behaviors).