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.\" Copyright (c) 1983, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)logger.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd December 5, 2017
.Dt LOGGER 1
.Os
.Sh NAME
.Nm logger
.Nd make entries in the system log
.Sh SYNOPSIS
.Nm
.Op Fl 46Ais
.Op Fl f Ar file
.Op Fl H Ar hostname
.Op Fl h Ar host
.Op Fl P Ar port
.Op Fl p Ar pri
.Op Fl S Ar addr Ns \&: Ns Ar port
.Op Fl t Ar tag
.Op Ar message ...
.Sh DESCRIPTION
The
.Nm
utility provides a shell command interface to the
.Xr syslog 3
system log module.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl 4
Force
.Nm
to use IPv4 addresses only.
.It Fl 6
Force
.Nm
to use IPv6 addresses only.
.It Fl A
By default,
.Nm
tries to send the message to only one address,
even if the host has more than one A or AAAA record.
If this option is specified,
.Nm
tries to send the message to all addresses.
.It Fl i
Log the process id of the logger process
with each line.
.It Fl s
Log the message to standard error, as well as the system log.
.It Fl f Ar file
Read the contents of the specified file into syslog.
This option is ignored when a message is also specified.
.It Fl H Ar hostname
Set the hostname in the header of the message to specified value.
If not specified, host part of
.Xr gethostname 3
will be used.
.It Fl h Ar host
Send the message to the remote system
.Ar host
instead of logging it locally.
Note that
.Nm
currently supports
.Li AF_INET
.Pq IPv4 ,
.Li AF_INET6
.Pq IPv6 ,
and
.Li AF_LOCAL
.Pq Unix-domain socket
address families.
The following address formats are valid in
.Ar host :
.Pp
.Bl -tag -width "AF_LOCAL" -compact
.It Li AF_INET
192.168.2.1
.It Li AF_INET6
2001:db8::1
.It Li AF_LOCAL
.Pa /var/run/log
.El
.It Fl P Ar port
Send the message to the specified
.Ar port
number on a remote system,
which can be specified as a service name
or as a decimal number.
The default is
.Dq Li syslog .
If an unknown service name is used,
.Nm
prints a warning and falls back to port 514.
.It Fl p Ar pri
Enter the message with the specified priority.
The priority may be specified numerically or as a
.Li facility.level
pair.
For example,
.Dq Fl p Li local3.info
logs the message(s) as
.Ar info Ns rmational
level in the
.Ar local3
facility.
The default is
.Dq Li user.notice .
.It Fl S Ar addr Ns \&: Ns Ar port
Specify source address and/or source port when using
.Fl h
option.
The same address will be used for all of the remote addresses
when
.Fl A
flag is enabled.
Note that a numeric IPv6 address in
.Ar addr
must be enclosed with
.Dq \&[
and
.Dq \&] .
.It Fl t Ar tag
Mark every line in the log with the specified
.Ar tag
rather than the default of current login name.
.It Ar message
Write the message to log; if not specified, and the
.Fl f
flag is not
provided, standard input is logged.
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
.Bd -literal -offset indent -compact
logger System rebooted
logger \-p local0.notice \-t HOSTIDM \-f /dev/idmc
.Ed
.Sh SEE ALSO
.Xr syslog 3 ,
.Xr syslogd 8
.Sh STANDARDS
The
.Nm
command is expected to be
.St -p1003.2
compatible.
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