journalctl - Query the systemd journal
To display all logs $ journalctl
To display the new entries first in logs $ journalctl -r
To display a specific number of log entries $ journalctl -n 5
To retrieve log entries containing a specific keyword $ journalctl | grep <keyword> $ journalctl | grep nginx $ journalctl | grep apache2
To display log entries based on their priority level $ journalctl -p warning
To display verbose output $ journalctl -o verbose
To view information about previous system boots $ journalctl --list-boots
To print help options $ journalctl --help
regards, T.Dhanasekar