journalctl --help - Query the journal.
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$ journalctl --help journalctl [OPTIONS...] [MATCHES...] Query the journal. Flags: --system Show the system journal --user Show the user journal for the current user -M --machine=CONTAINER Operate on local container -S --since=DATE Show entries not older than the specified date -U --until=DATE Show entries not newer than the specified date -c --cursor=CURSOR Show entries starting at the specified cursor --after-cursor=CURSOR Show entries after the specified cursor --show-cursor Print the cursor after all the entries -b --boot[=ID] Show current boot or the specified boot --list-boots Show terse information about recorded boots -k --dmesg Show kernel message log from the current boot -u --unit=UNIT Show logs from the specified unit -t --identifier=STRING Show entries with the specified syslog identifier -p --priority=RANGE Show entries with the specified priority -e --pager-end Immediately jump to the end in the pager -f --follow Follow the journal -n --lines[=INTEGER] Number of journal entries to show --no-tail Show all lines, even in follow mode -r --reverse Show the newest entries first -o --output=STRING Change journal output mode (short, short-iso, short-precise, short-monotonic, verbose, export, json, json-pretty, json-sse, cat) --utc Express time in Coordinated Universal Time (UTC) -x --catalog Add message explanations where available --no-full Ellipsize fields -a --all Show all fields, including long and unprintable -q --quiet Do not show privilege warning --no-pager Do not pipe output into a pager -m --merge Show entries from all available journals -D --directory=PATH Show journal files from directory --file=PATH Show journal file --root=ROOT Operate on catalog files underneath the root ROOT --interval=TIME Time interval for changing the FSS sealing key --verify-key=KEY Specify FSS verification key --force Override of the FSS key pair with --setup-keys Commands: -h --help Show this help text --version Show package version -F --field=FIELD List all values that a specified field takes --new-id128 Generate a new 128-bit ID --disk-usage Show total disk usage of all journal files --vacuum-size=BYTES Reduce disk usage below specified size --vacuum-time=TIME Remove journal files older than specified date --flush Flush all journal data from /run into /var --header Show journal header information --list-catalog Show all message IDs in the catalog --dump-catalog Show entries in the message catalog --update-catalog Update the message catalog database --setup-keys Generate a new FSS key pair --verify Verify journal file consistency
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