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DDG = Abbreviation for https://DuckDuckGo.com.
The tutorial you’re talking about has been updated as that was indeed not clear, please verify if this is clearer now: -
In contrast to the
ksystemlogGUI program, thejournalctlCLI program has a more fine-tuned parameter to find out what is what:--priority= Filter output by message priorities or priority ranges. Takes either a single numeric or textual log level (i.e. between 0/"emerg" and 7/"debug"), or a range of numeric/text log levels in the form FROM..TO. The log levels are the usual syslog log levels as documented in syslog(3), i.e. "emerg" (0), "alert" (1), "crit" (2), "err" (3), "warning" (4), "notice" (5), "info" (6), "debug" (7). If a single log level is specified, all messages with this log level or a lower (hence more important) log level are shown. If a range is specified, all messages within the range are shown, including both the start and the end value of the range. This will add "PRIORITY=" matches for the specified priorities. -
Examples:
journalctl --system --boot=0 --priority=errwill give you all
systemerrors of the current0bootjournalctl --boot=-1 --priority=4will give you all warnings
4of the previous-1boot. -
For more info:
man journalctl
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