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LOGGER(1)                                 User Commands                                 LOGGER(1)

       logger - a shell command interface to the syslog(3) system log module

       logger [options] [message]

       logger makes entries in the system log.  It provides a shell command interface to the sys‐
       log(3) system log module.

       -d, --udp
              Use datagram (UDP) only.  By default the connection is tried  to  the  syslog  port
              defined in /etc/services, which is often 514.

       -h, --help
              Display help text and exit.

       -i, --id
              Log the process ID of the logger process with each line.

       -n, --server server
              Write to the specified remote syslog server instead of to the builtin syslog
              routines.  Unless --udp or --tcp is specified, logger will first try to  use
              UDP, but if thist fails a TCP connection is attempted.

       -P, --port port
              Use the specified port.

       -f, --file file
              Log the contents of the specified file.  This option cannot be combined with
              a command-line message.

       -p, --priority priority
              Enter the message into the log with the specified  priority.   The  priority
              may  be  specified numerically or as a facility.level pair.  For example, -p
              local3.info logs the message as informational in the local3  facility.   The
              default is user.notice.

              Look  for a syslog prefix on every line read from standard input.  This pre‐
              fix is a number within angle brackets that contains both  the  facility  and
              the  level.   This decimal prefix is constructed by multiplying the facility
              by 8 and then adding the level.  Thus, for example, local0.info, facility=16
              and level=6, becomes <134>.

              If  the prefix contains no facility, the facility defaults to what is speci‐
              fied by the -p option.  Similarly, if no prefix is  provided,  the  line  is
              logged using the -p priority.

              This option doesn't affect a command-line message.

       -s, --stderr
              Output the message to standard error as well as to the system log.

       -T, --tcp
              Use  stream  (TCP)  only.  By default the connection is tried to the syslog-
              conn port defined in /etc/services, which is often 601.

       -t, --tag tag
              Mark every line to be logged with the specified tag.

       -u, --socket socket
              Write to the specified socket instead of to the builtin syslog routines.

       --journald [file]
              Write systemd journal entry.  The entry is read from stdin  or  input  file.
              Each new line must begin with a field that is accepted by journald, see sys‐
              temd.journal-fields(7) for details.  Use of MESSAGE_ID  field  is  generally
              good idea, as they make finding entries easy.

              $ printf "%s\n%s\n%s\n" MESSAGE_ID=86184c3b1aa444f58ebe7b30fec1438b DOGS=bark "CARAVAN=goes on" | logger --journald
              $ logger --journald=entry.txt

              Notice  that  --journald will ignore values of other options, such as prior‐
              ity.  If priority is needed it must be within input, and use PRIORITY field.
              The  simple  execution  of journalctl will display MESSAGE field.  Use jour‐
              nalctl --output json-pretty to see rest of the fields.

       -V, --version
              Display version information and exit.

       --     End the argument list.  This is to allow the message to start with a  hyphen

              Write this message to the log; if not specified, and the -f flag is not pro‐
              vided, standard input is logged.

       The logger utility exits 0 on success, and >0 if an error occurs.

       Valid facility names are: auth, authpriv (for security information of  a  sensitive
       nature),   cron, daemon, ftp, kern   (can't   be   generated  from  user  process),
       lpr, mail, news, security (deprecated synonym  for  auth), syslog, user, uucp,  and
       local0 to local7, inclusive.

       Valid  level  names  are: alert, crit, debug, emerg, err, error (deprecated synonym
       for err), info, notice, panic (deprecated synonym for emerg), warning, warn (depre‐
       cated  synonym for warning).  For the priority order and intended purposes of these
       levels, see syslog(3).

       logger System rebooted
       logger -p local0.notice -t HOSTIDM -f /dev/idmc
       logger -n loghost.example.com System rebooted

       syslog(3), syslogd(8), journalctl(1), systemd.journal-fields(7)

       The logger command is expected to be IEEE Std 1003.2 ("POSIX.2") compatible.

       The logger command is part of the util-linux package and is  available  from  Linux
       Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-linux/⟩.

util-linux                                  April 2013                                  LOGGER(1)

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