journalctl Reference
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[Linux]
Use with sudo to ensure seeing all records.
Display a table of boot records
journalctl --list-boots
Show log of specific boot
journalctl -b [-n] (n is boot number; current boot if omitted)
Show log by date ranges
journalctl --since [now, yesterday, today, tomorrow]
journalctl --since YYYY-MM-DD [--until YYYY-MM-DD]
journalctl --since "20days ago"
(check the man page for systemd.time for date string syntax)
Filter by service or priority
journalctl -u some.service
journalctl -p [priority] (crit, err, info, etc.)
Other options
journalctl -k (kernel messages)
journalctl -r (reverse order)
journalctl -n15 (number of lines to show)
journalctl --no-pager (output full record without "less")
journalctl -f (follow log; like "tail -f")