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Example Linux Commands flashcards
What command lists all running services/daemons on a systemd system?
systemctl list-units --type=service --state=running
How do you start, stop, and restart a service named 'nginx'?
systemctl start nginx
systemctl stop nginx
systemctl restart nginx
What command enables a service to start automatically on boot?
systemctl enable <service-name>
How do you view real-time logs for a systemd service?
journalctl -u <service-name> -f
What does 'systemctl status <service>' show you?
Current state (active/inactive), recent logs, PID, memory/CPU usage, and enabled/disabled status
How do you reload a service configuration without stopping it?
systemctl reload <service-name>
What command shows all failed services on the system?
systemctl list-units --failed
How do you check if a service is enabled for auto-start?
systemctl is-enabled <service-name>
What's the difference between 'stop' and 'disable' for a service?
stop = halts service immediately; disable = prevents auto-start on next boot (does not stop current instance)
How do you view detailed logs including errors for a service from the last hour?
journalctl -u <service-name> --since '1 hour ago' -p err..alert
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