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Essential Linux server administration commands for monitoring, management, and troubleshooting.
List all listening ports and the processes behind them
ss -tulnpFind a running process by name
ps aux | grep process_nameDisplay disk usage of all mounted filesystems
df -hCheck the total size of a specific directory
du -sh /var/log/Stream a log file in real-time
tail -f /var/log/syslogDisplay RAM and swap usage in human-readable format
free -hSearch for files matching a pattern recursively
find / -name "*.conf" 2>/dev/nullShow all active network connections with PIDs
netstat -antpShow the last 20 login events
last -n 20Open the cron job editor for the current user
crontab -eDisplay kernel and OS information
uname -aMonitor CPU, memory and process activity interactively
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