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systemd-journalctl(1) [debian man page]

SYSTEMD-JOURNALCTL(1)						systemd-journalctl					     SYSTEMD-JOURNALCTL(1)

NAME

       systemd-journalctl - Query the systemd journal

SYNOPSIS

       systemd-journalctl [OPTIONS...] [MATCH]

DESCRIPTION

       systemd-journalctl may be used to query the contents of the systemd(1) journal.

       If called without parameter will show the full contents of the journal, starting with the oldest entry collected.

       If a match argument is passed the output is filtered accordingly. A match is in the format FIELD=VALUE, e.g.  _SYSTEMD_UNIT=httpd.service.

       Output is interleaved from all accessible journal files, whether they are rotated or currently being written, and regardless whether they
       belong to the system itself or are accessible user journals.

       All users are granted access to their private per-user journals. However, by default only root and users who are members of the adm group
       get access to the system journal and the journals of other users.

OPTIONS

       The following options are understood:

       --help, -h
	   Prints a short help text and exits.

       --version
	   Prints a short version string and exits.

       --no-pager
	   Do not pipe output into a pager.

       --all, -a
	   Show all fields in full, even if they include unprintable characters or are very long.

       --follow, -f
	   Show only most recent journal entries, and continously print new entries as they are appended to the journal.

       --lines=, -n
	   Controls the number of journal lines to show, counting from the most recent ones. Takes a positive integer argument. In follow mode
	   defaults to 10, otherwise is unset thus not limiting how many lines are shown.

       --no-tail
	   Show all stored output lines, even in follow mode. Undoes the effect of --lines=.

       --output=, -o
	   Controls the formatting of the journal entries that are shown. Takes one of short, short-monotonic, verbose, export, json, cat.  short
	   is the default and generates an output that is mostly identical to the formatting of classic syslog log files, showing one line per
	   journal entry.  short-monotonic is very similar but shows monotonic timestamps instead of wallclock timestamps.  verbose shows the full
	   structered entry items with all fiels.  export serializes the journal into a binary (but mostly text-based) stream suitable for backups
	   and network transfer.  json formats entries as JSON data structures.  cat generates a very terse output only showing the actual message
	   of each journal entry with no meta data, not even a timestamp.

       --quiet, -q
	   Suppresses any warning message regarding inaccessable system journals when run as normal user.

       --new-id128
	   Instead of showing journal contents generate a new 128 bit ID suitable for identifying messages. This is intended for usage by
	   developers who need a new identifier for a new message they introduce and want to make recognizable. Will print the new ID in three
	   different formats which can be copied into source code or similar.

EXIT STATUS

       On success 0 is returned, a non-zero failure code otherwise.

ENVIRONMENT

       $SYSTEMD_PAGER
	   Pager to use when --no-pager is not given; overrides $PAGER. Setting this to an empty string or the value cat is equivalent to passing
	   --no-pager.

SEE ALSO

       systemd(1), systemctl(1), systemd-journald.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013						     SYSTEMD-JOURNALCTL(1)

Check Out this Related Man Page

SYSTEMD-CAT(1)                                                      systemd-cat                                                     SYSTEMD-CAT(1)

NAME

       systemd-cat - Connect a pipeline or program's output with the journal

SYNOPSIS

       systemd-cat [OPTIONS...] [COMMAND] [ARGUMENTS...]

       systemd-cat [OPTIONS...]

DESCRIPTION

       systemd-cat may be used to connect the standard input and output of a process to the journal, or as a filter tool in a shell pipeline to
       pass the output the previous pipeline element generates to the journal.

       If no parameter is passed, systemd-cat will write everything it reads from standard input (stdin) to the journal.

       If parameters are passed, they are executed as command line with standard output (stdout) and standard error output (stderr) connected to
       the journal, so that all it writes is stored in the journal.

OPTIONS

       The following options are understood:

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

       -t, --identifier=
           Specify a short string that is used to identify the logging tool. If not specified, no identification string is written to the journal.

       -p, --priority=
           Specify the default priority level for the logged messages. Pass one of "emerg", "alert", "crit", "err", "warning", "notice", "info",
           "debug", or a value between 0 and 7 (corresponding to the same named levels). These priority values are the same as defined by
           syslog(3). Defaults to "info". Note that this simply controls the default, individual lines may be logged with different levels if they
           are prefixed accordingly. For details, see --level-prefix= below.

       --level-prefix=
           Controls whether lines read are parsed for syslog priority level prefixes. If enabled (the default), a line prefixed with a priority
           prefix such as "<5>" is logged at priority 5 ("notice"), and similar for the other priority levels. Takes a boolean argument.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

EXAMPLES

       Example 1. Invoke a program

       This calls /bin/ls with standard output and error connected to the journal:

           # systemd-cat ls

       Example 2. Usage in a shell pipeline

       This builds a shell pipeline also invoking /bin/ls and writes the output it generates to the journal:

           # ls | systemd-cat

       Even though the two examples have very similar effects the first is preferable since only one process is running at a time, and both stdout
       and stderr are captured while in the second example, only stdout is captured.

SEE ALSO

       systemd(1), systemctl(1), logger(1)

systemd 237                                                                                                                         SYSTEMD-CAT(1)
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