Linux Command Cheat Sheet | Bash, AWK, Grep, Sed, Find | Reference Guide (PDF Download)

Stop Googling the same commands over and over. 🔥
This 27-page cheat sheet bundle gives you every essential Linux command, script template, and troubleshooting playbook in one organized, copy-paste-ready PDF.

✅ WHAT'S INSIDE:
📄 1. Essential Commands Quick Reference — file operations, navigation, package management (dnf + apt), system info
📄 2. Bash Scripting Cheat Sheet — variables, arrays, parameter expansion, loops, functions, trap, set -euo pipefail, production script template with logging and locking
📄 3. Text Processing Toolkit — grep, awk, sed, find with real-world examples + Top 20 one-liner pipelines for sysadmins
📄 4. File Permissions and Security — chmod, chown, SUID/SGID/sticky bit, ACLs (setfacl/getfacl), chattr immutable files
📄 5. Process and Service Management — ps, kill signals, systemctl, journalctl, custom systemd unit file template
📄 6. User and Group Administration — useradd, sudo configuration, password aging, key system files explained
📄 7. Cron and Scheduling — crontab format, systemd timers (the modern alternative), anacron
📄 8. Troubleshooting Playbooks (7 real-world scenarios) — Disk Full, High CPU, OOM Kill, Cannot SSH, Service Won't Start, Slow System (USE Method), Network Unreachable
📄 9. BONUS: First 60 Seconds Checklist — the 8 commands to run immediately when something goes wrong in production

🎯 WHO THIS IS FOR:
✅ Linux system administrators (junior to senior)
✅ DevOps and SRE engineers
✅ Software developers working with Linux servers
✅ Students preparing for RHCSA / RHCE / LFCS certification
✅ Anyone who manages Linux systems and wants a quick desk reference

⚡ KEY FEATURES:
💡 Based on RHEL 9 / Rocky Linux 9 / AlmaLinux 9 (kernel 5.14+, systemd 252+, Podman 5.0)
💡 Valid for 2026-2030 — no deprecated commands
💡 Every command is copy-paste ready
💡 Includes both dnf (RHEL family) and apt (Debian/Ubuntu) package commands
💡 Production-tested script templates you can use immediately
💡 7 troubleshooting playbooks with step-by-step commands (this section alone is worth the price)
💡 Clean, professional formatting — easy to read on screen or print

🔧 WORKS WITH:
✅ RHEL 9, Rocky Linux 9, AlmaLinux 9, Oracle Linux 9
✅ Ubuntu 22.04+, Debian 12+
✅ Any modern Linux distribution with systemd
✅ Cloud instances (AWS, Azure, OCI, GCP)

👨‍💻 ABOUT THE AUTHOR:
Created by Bo Wang, Principal Technical Support Engineer at Oracle New Zealand with 17 years of IT experience supporting production Linux systems at enterprise scale. Career path: IBM China → Oracle China → Oracle NZ. Certified RHCE, CCNP, PMP, OCI. Every command in this guide has been tested in real production environments.

📄 FORMAT:
🎁 Premium A4 PDF — professionally formatted, 27 pages
📥 Instant digital download — no waiting, no shipping
🖨️ Print-friendly — no watermarks on content pages

⬇️ INSTANT DOWNLOAD:
After purchase, download your PDF immediately from Etsy. No waiting, no shipping. Open on any device, print as many copies as you need for personal use.

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