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 syslog(3) system log module.
-n, --server server
Write to the specified remote syslog server instead of to the builtin syslog routines. Unless --udp or --tcp is specified the log-
ger 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 command-line message.
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 user.notice.
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, 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 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 synonym for warning). For the priority order and intended purposes of these levels, see syslog(3).
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 Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
util-linux April 2013 LOGGER(1)