logger(1) - phpMan

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 sys-
log(3) system log module.

OPTIONS
-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.

-d, --udp
Use datagram (UDP) only. By default the connection is tried to syslog port defined
in /etc/services, which is often 514.

-T, --tcp
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. When this option is not specified, the port defaults to
syslog for udp and to syslog-conn for tcp connections.

-i, --id
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-
mand-line message.

-h, --help
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.

-S, --size size
Sets the maximum permitted message size. The default is 1KiB, which is the limit
traditionally used and specified in RFC 3164. When selecting a maximum message
size, it is important to ensure that the receiver supports the max size as well,
otherwise messages may become truncated.

-s, --stderr
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. The default tag is the name
of the user logged in on the terminal (or a user name based on effective user ID).

-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 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.

FACILITIES AND LEVELS
Valid facility names are:

auth
authpriv for security information of a sensitive nature
cron
daemon
ftp
kern cannot be generated from userspace process, automatically converted to user
lpr
mail
news
syslog
user
uucp
local0
to
local7
security deprecated synonym for auth

Valid level names are:

emerg
alert
crit
err
warning
notice
info
debug
panic deprecated synonym for emerg
error deprecated synonym for err
warn deprecated synonym for warning

For the priority order and intended purposes of these facilities and levels, see sys-
log(3).

EXAMPLES
logger System rebooted
logger -p local0.notice -t HOSTIDM -f /dev/idmc
logger -n loghost.example.com System rebooted