Foundations: Linux Essentials for DevOps 🚀🐧

Whether you're just stepping into the world of DevOps or looking to solidify your foundation, mastering Linux Essentials is non-negotiable. Linux is the backbone of most modern infrastructure, especially in cloud and containerized environments.

🔧 Why Linux Matters in DevOps:

• 🌐 Most servers and cloud instances run on Linux.

• 🐳 Tools like Docker, Kubernetes, and Terraform are Linux-native.

• 🧰 CI/CD pipelines, automation scripts, and monitoring tools often rely on Linux commands and environments.

📚 What You Should Learn:

1. Basic Commands
   ls, cd, pwd, cp, mv, rm, touch, cat, grep, find, man, echo

2. File System Structure
   Understand /etc, /var, /usr, /bin, /home, /tmp, and permissions (chmod, chown).

3. User and Group Management
   useradd, usermod, groupadd, passwd, su, sudo

4. Process Management
   ps, top, kill, nice, htop

5. Package Management

   • Ubuntu/Debian: apt, dpkg

   • RHEL/CentOS: yum, dnf, rpm

6. Networking Commands
   ping, netstat, ifconfig, ip, curl, wget, ss

7. Shell Scripting Basics
   Variables, loops, conditionals, and writing simple .sh scripts to automate tasks.

8. System Monitoring & Logs

   • Logs: /var/log/

   • Commands: journalctl, dmesg, tail, less, logrotate

9. Crontab & Scheduling Jobs
   crontab -e, at, systemd timers

10. Using SSH and SCP
    ssh, scp, ssh-keygen, managing .ssh/config

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💡 Pro Tip: Practice on a free-tier cloud VM (AWS, GCP, Azure) or spin up a local VM with VirtualBox + Ubuntu Server. Use challenges like OverTheWire to build confidence.

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🔥 Next Steps: Once you're comfortable, dive into Git, Bash scripting, Ansible, Docker, and Kubernetes — all of which build on these Linux foundations.

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