journalctl

Control the systemd login manager

journalctl is used to read and query systemd's journal database.

However, if invoked with the -k or --dmesg switches, it will be equivalent to using the dmesg command:

other interesting journalctl options are:

• -b shows boot information.
• -u shows messages about a specified unit.
• -f shows most recent journal messages and keeps printing new entries as they are appended to the journal.