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LOGGER(1)                                 User Commands                                 LOGGER(1)

NAME
       logger - enter messages into the system log

SYNOPSIS
       logger [options] [message]

DESCRIPTION
       logger makes entries in the system log.

       When  the  optional  message  argument is present, it is written to the log.  If it is not
       present, and the -f option is not given either, then standard input is logged.

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

       -e, --skip-empty
              When  processing files, empty lines will be ignored. An empty line is defined to be
              a line without any characters. Thus a line consisting only  of  whitespace  is  NOT
              considered empty.  Note that when the --prio-prefix option is specified, the prior‐
              ity is not part of the line. Thus an empty line in this mode is a  line  that  does
              not have any characters after the priority (e.g. "<13>").

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

       -i     Log the PID of the logger process with each line.

       --id[=id]
              Log the PID of the logger process with each line.  When the optional argument id is
              specified, then it is used instead of the logger command's PID.  The use of --id=$$
              (PPID) is recommended in scripts that send several messages.

       --journald[=file]
              Write a systemd journal entry.  The entry is read from the given file, when  speci‐
              fied,  otherwise  from  standard  input.  Each line must begin with a field that is
              accepted by journald; see systemd.journal-fields(7) for details.  The use of a MES‐
              SAGE_ID  field  is  generally a good idea, as it makes finding entries easy.  Exam‐
              ples:

                  logger --journald <.

              If  the  prefix contains no facility, the facility defaults to what is specified by
              the -p option.  Similarly, if no prefix is provided, the line is logged  using  the
              priority given with -p.

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

       --rfc3164
              Use the RFC 3164 BSD syslog protocol to submit messages to a remote server.

       --rfc5424[=without]
              Use  the  RFC  5424  syslog  protocol  to  submit messages to a remote server.  The
              optional without argument can be a comma-separated list of  the  following  values:
              notq,  notime,  nohost.  The notq value suppresses the time-quality structured data
              from the submitted message.  (The time-quality information shows whether the  local
              clock  was synchronized plus the maximum number of microseconds the timestamp might
              be off.)  The notime value (which implies  notq)  suppresses  the  complete  sender
              timestamp  that  is  in  ISO-8601 format, including microseconds and timezone.  The
              nohost value suppresses gethostname(2) information from the message header.

              The RFC 5424 protocol has been the default for logger since version 2.26.

       --octet-count
              Use the RFC 6587 octet counting framing method  for  sending  messages.  When  this
              option  is not used, the default is no framing on UDP, and RFC6587 non-transparent-
              framing (also known as octet stuffing) on TCP.

       -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 system log socket.

       --socket-errors[=mode]
              Print errors about Unix socket connections.  The mode can be a value of off, on, or
              auto.  When the mode is auto logger will detect if the init process is systemd, and
              if  so  assumption  is made /dev/log can be used early at boot.  Other init systems
              lack of /dev/log will not cause errors that is identical with messaging using open‐
              log(3)  system call.  The logger(1) before version 2.26 used openlog, and hence was
              inable to detected loss of messages sent to Unix sockets.

              The default mode is auto.  When errors are not enabled lost messages are not commu‐
              nicated and will result to successful return value of logger(1) invocation.

       --     End the argument list.  This allows the message to start with a hyphen (-).

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

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

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

FACILITIES AND LEVELS
       Valid facility names are:

              auth
              authpriv   for security information of a sensitive nature
              cron
              daemon
              ftp
              kern       cannot be generated from userspace process, automatically converted to user
              lpr
              mail
              news
              syslog
              user
              uucp
              local0
                to
              local7
              security   deprecated synonym for auth

       Valid level names are:

              emerg
              alert
              crit

              err
              warning
              notice
              info
              debug
              panic     deprecated synonym for emerg
              error     deprecated synonym for err
              warn      deprecated synonym for warning

       For  the  priority  order  and  intended purposes of these facilities and levels, see sys‐
       log(3).

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

SEE ALSO
       syslog(3), journalctl(1), systemd.journal-fields(7)

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

AVAILABILITY
       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                                  March 2015                                  LOGGER(1)

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