freebsd-dev/usr.bin/logger/logger.1

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.\" Copyright (c) 1983, 1990, 1993
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.\" may be used to endorse or promote products derived from this software
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.\" @(#)logger.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
.Dd December 5, 2017
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.Dt LOGGER 1
.Os
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.Sh NAME
.Nm logger
.Nd make entries in the system log
.Sh SYNOPSIS
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.Nm
.Op Fl 46Ais
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.Op Fl f Ar file
.Op Fl H Ar hostname
.Op Fl h Ar host
.Op Fl P Ar port
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.Op Fl p Ar pri
.Op Fl S Ar addr Ns \&: Ns Ar port
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.Op Fl t Ar tag
.Op Ar message ...
.Sh DESCRIPTION
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The
.Nm
utility provides a shell command interface to the
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.Xr syslog 3
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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.
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.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.
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.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.
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.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.
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The default is
.Dq Li syslog .
If an unknown service name is used,
.Nm
prints a warning and falls back to port 514.
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.It Fl p Ar pri
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Enter the message with the specified priority.
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The priority may be specified numerically or as a
.Li facility.level
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pair.
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For example,
.Dq Fl p Li local3.info
logs the message(s) as
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.Ar info Ns rmational
level in the
.Ar local3
facility.
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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
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.Dq \&[
and
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.Dq \&] .
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.It Fl t Ar tag
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Mark every line in the log with the specified
.Ar tag
rather than the default of current login name.
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.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
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.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
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.Nm
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command is expected to be
.St -p1003.2
compatible.