LOGGER(1) User Commands LOGGER(1)NAME
logger - a shell command interface to the syslog(3) system log module
SYNOPSIS
logger [options] [message]
DESCRIPTION
logger makes entries in the system log. It provides a shell command
interface to the syslog(3) system log module.
OPTIONS-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 prior‐
ity. 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.
--prio-prefix
Look for a syslog prefix on every line read from standard
input. This prefix is a number within angle brackets
that contains both the facility and the level. This dec‐
imal 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 specified by the -p option. Similarly, if no
prefix is provided, the line is logged using the -p pri‐
ority.
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.
-V, --version
Display version information and exit.
-- End the argument list. This is to allow the message to
start with a hyphen (-).
message
Write this message to the log; if not specified, and the
-f flag is not provided, 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 informa‐
tion of a sensitive nature), cron, daemon, ftp, kern (can't be
generated from user process), lpr, mail, news, security (depre‐
cated 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 (deprecated synonym for warn‐
ing). For the priority order and intended purposes of these
levels, see syslog(3).
EXAMPLES
logger System rebooted
logger -p local0.notice -t HOSTIDM -f /dev/idmc
logger -n loghost.example.com System rebooted
SEE ALSOsyslog(3), syslogd(8)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 April 2013 LOGGER(1)
