By Priority

One filter that system administrators often are interested in is the message priority. While it is often useful to log information at a very verbose level, when actually digesting the available information, low priority logs can be distracting and confusing.

You can use journalctl to display only messages of a specified priority or above by using the -poption. This allows you to filter out lower priority messages.

For instance, to show only entries logged at the error level or above, you can type:

journalctl -p err -b