LOGGER(1) User Commands LOGGER(1)
logger - a shell command interface to the syslog(3) system log module
logger [options] [message]
logger makes entries in the system log. It provides a shell command interface to the sys-
log(3) system log module.
-n, --server server
Write to the specified remote syslog server instead of to the builtin syslog rou-
tines. Unless --udp or --tcp is specified the logger will first try to use UDP,
but if it fails a TCP connection is attempted.
Use datagram (UDP) only. By default the connection is tried to syslog port defined
in /etc/services, which is often 514.
Use stream (TCP) only. By default the connection is tried to syslog-conn port
defined in /etc/services, which is often 601.
-P, --port port
Use the specified port.
Log the process ID of the logger process with each line.
-f, --file file
Log the contents of the specified file. This option cannot be combined with a com-
Display a help text and exit.
-p, --priority priority
Enter the message into the log with the specified priority. 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
Output the message to standard error as well as to the system log.
-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.
Display version information and exit.
-- End the argument list. This is to allow the message to start with a hyphen (-).
Write the message to log; if not specified, and the -f flag is not provided, stan-
dard input is logged.
The logger utility exits 0 on success, and >0 if an error occurs.
Valid facility names are: auth, authpriv (for security information of a sensitive nature),
cron, daemon, ftp, kern (can't be generated from user process), lpr, mail, news, security
(deprecated 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 syn-
onym for warning). For the priority order and intended purposes of these levels, see sys-
logger System rebooted
logger -p local0.notice -t HOSTIDM -f /dev/idmc
logger -n loghost.example.com System rebooted
The logger command is expected to be IEEE Std 1003.2 ("POSIX.2") compatible.
The logger command is part of the util-linux package and is available from Linux Kernel
util-linux April 2013 LOGGER(1)