How do i display systemd journal log entries by priority using journalctl?
pangolinsos last edited by pangolinsos
-b [ID][±offset], --boot=[ID][±offset] Show messages from a specific boot. This will add a match for "_BOOT_ID=". The argument may be empty, in which case logs for the current boot will be shown. If the boot ID is omitted, a positive offset will look up the boots starting from the beginning of the journal, and a equal-or-less-than zero offset will look up boots starting from the end of the journal. Thus, 1 means the first boot found in the journal in chronological order, 2 the second and so on; while -0 is the last boot, -1 the boot before last, and so on. An empty offset is equivalent to specifying -0, except when the current boot is not the last boot (e.g. because --directory was specified to look at logs from a different machine). If the 32-character ID is specified, it may optionally be followed by offset which identifies the boot relative to the one given by boot ID. Negative values mean earlier boots and a positive values mean later boots. If offset is not specified, a value of zero is assumed, and the logs for the boot given by ID are shown.
-p, --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.
Display entries from current journal that have priority of err.
$ journalctl -b -p "err" -- Logs begin at Sun 2019-02-03 11:15:35 UTC, end at Sun 2019-02-03 13:45:36 UTC. -- Feb 03 11:15:36 training1 kernel: piix4_smbus 0000:00:01.3: SMBus base address uninitialized Feb 03 11:16:32 training1 systemd: Failed to start Crash recovery k
These are the syslog or logger priorities.
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