journalctl --help - Query the journal.



  • $ 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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