2019-10-13 18:14:51 +05:30
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.\" -*- nroff -*-
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.\" Copyright (c) 2018, 2019 Joachim Nilsson <troglobit@gmail.com>
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.\" All rights reserved.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.Dd Oct 13, 2019
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.Dt logger 1
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.Os "sysklogd (2.0)"
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.Sh NAME
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.Nm logger
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.Nd Send messages to system log, or a log file
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.Sh SYNOPSIS
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.Nm
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.Op Fl hsv
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.Op Fl f Ar FILE
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.Op Fl p Ar PRIO
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.Op Fl r Ar SIZE:NUM
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.Op Fl t Ar TAG
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.Op Ar MESSAGE
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.Sh DESCRIPTIOMN
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.Nm
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can be used to log messages to the system log daemon from a UNIX shell,
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or script. Optionally a stand-alone log file can be used, which is the
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automatically log rotated. Without a
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.Ar MESSAGE
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argument
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.Nm
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reads input from
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.Ar stdin .
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.Sh OPTIONS
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This program follows the usual UNIX command line syntax:
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.Bl -tag -width Ds
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.It Fl f Ar FILE
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Log file to write messages to, instead of syslog daemon.
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.Nm
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accepts
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.Fl f-
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as an alias for
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.Ar stdout .
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.It Fl h
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Show program help.
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.It Fl p Ar PRIO
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Priority, numeric or
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.Ar facility.severity
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pair.
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.It Fl r Ar SIZE:NUM
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Controls log file rotation.
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.Ar SIZE
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denotes number of bytes before rotating, default: 200 kB.
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.Ar NUM
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denotes number of rotated files to keep when logging to a file, default:
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5.
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.It Fl s
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Log to stderr as well as the system log.
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.It Fl t Ar TAG
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Log using the specified tag, default: username.
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.It Fl v
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Show program version.
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.It Ar MESSAGE
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Log message to write. Remember to use single/double qoutes if calling
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.Nm
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from a shell prompt due to expansion the shell does. If no message is
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given
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.Nm
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will read from
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.Ar stdin
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until EOF. In this mode every new row (newline separated) is converted
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into an independent
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.Xr syslog 3
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call.
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.El
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.Sh EXAMPLES
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.Bd -unfilled -offset left
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logger -t dropbear -p auth.notice "Successful login for user 'admin' from 1.2.3.4"
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logger -t udhcpc -f /tmp/script.log "New lease 1.2.3.200 obtained for interface eth0"
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.Ed
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.Sh FILES
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.Bl -tag -width /var/run/log -compact
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.It Ar FILE
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If a log file is enabled, using
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.Fl f Ar FILE ,
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then this file is opened and written to by
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.Nm .
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With log file rotation,
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.Fl r Ar SIZE:NUM ,
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this means
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.Nm
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also creates
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.Pa FILE.1 FILE.2 FILE.3.gz
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etc.
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.It Pa /var/run/log
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Socket to connect to for communicating with
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.Xr syslogd 8 .
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In older implementations
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.Pa /dev/log
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was used. This means this version of
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.Nm
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is not compatible with older releases, or other (local) syslog servers.
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.El
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.Sh SEE ALSO
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.Xr syslog 3
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.Xr syslogd 8
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.Sh AUTHORS
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.Nm
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was originally written by Joachim Nilsson to be a part of the
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.Xr finit 1
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system monitor (PID 1), where it is called
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.Nm logit .
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It is included here to complement
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.Xr syslogd 8
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and be extended upon in the sysklogd project.
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.Sh STANDARDS
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The
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.Nm
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command is expected to be IEEE Std 1003.2 ("POSIX.2") compatible, with
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extensions for RFC5424 and log file rotation.
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.Sh AVAILABILITY
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