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infrastructure/servers/linux-administration/SKILL.md

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+---
+name: linux-administration
+description: System administration for Linux servers. Manage packages, services, and system configuration. Use when administering Linux systems.
+license: MIT
+metadata:
+  author: devops-skills
+  version: "1.0"
+---
+
+# Linux Administration
+
+Core Linux system administration skills.
+
+## Package Management
+
+```bash
+# Debian/Ubuntu
+apt update && apt upgrade -y
+apt install nginx
+apt remove nginx
+apt autoremove
+
+# RHEL/CentOS
+dnf update
+dnf install nginx
+dnf remove nginx
+```
+
+## System Information
+
+```bash
+uname -a           # Kernel info
+hostnamectl        # System info
+lscpu              # CPU info
+free -h            # Memory usage
+df -h              # Disk usage
+ip addr            # Network interfaces
+```
+
+## Log Management
+
+```bash
+journalctl -u nginx          # Service logs
+journalctl -f                # Follow logs
+tail -f /var/log/syslog      # System logs
+dmesg                        # Kernel messages
+```
+
+## Process Management
+
+```bash
+ps aux | grep nginx
+top / htop
+kill -9 <pid>
+pgrep nginx
+pkill nginx
+```
+
+## Best Practices
+
+- Regular updates
+- Minimal installed packages
+- Proper file permissions
+- Log rotation configuration
+- Automated backups