Linux Administration/System Services/System Logging/Journalctl

Journalctl command allows to query the contents of the systemd journal/logs.

Basic Commands

 * or
 * (reverse order)
 * journalctl -k : Show only kernel messages
 * (follow)


 * Disk Usage/Logging:
 * --vacuum-size=BYTES  Reduce disk usage below specified size
 * --vacuum-files=INT   Leave only the specified number of journal files
 * --vacuum-time=TIME   Remove journal files older than specified time
 * . See also:
 * --vacuum-time=TIME   Remove journal files older than specified time
 * . See also: