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Journalctl

List by service name -u:​

journalctl -u SERVICE_NAME

You can use --since flag:​

journalctl -u SERVICE_NAME --since "1 hour ago"
journalctl -u SERVICE_NAME --since yesterday
journalctl -u SERVICE_NAME --since today
journalctl -u SERVICE_NAME --since "2026-01-23 14:00"  --until "2026-01-27 15:30:00"

You can mention number of rows to view:​

journalctl -u SERVICE_NAME -f -n 100

Show errors only:​

journalctl -u SERVICE_NAME -p err

List all services:​

systemctl list-units --type=service | grep foo