About
Journalctl is an utility to see the system logs.
Management
To see all log of a service
journalctl -u serviceName
# or qualified
journalctl -u serviceName.service
To see only log messages for the current boot
journalctl -u serviceName -b
# or qualified
journalctl -u serviceName.service -b
To see system logs
to see system logs live …
journalctl -f
Log from the last hour
To see logs from e.g. the last hour, and only from the cron daemon:
journalctl --since "1 hour ago" -t CRON