logger command is used to add messages to the system log, which is also known as the syslog. It is a useful tool for system administrators who need to keep track of various system events, such as system startups, shutdowns, and other system-related activities.
logger command is used to add messages to the system log, which can be accessed using the
syslog command. The syntax for the
logger command is as follows:
logger [options] [message]
options are used to modify the behavior of the
logger command, while the
message is the text that will be added to the system log. If no
message is specified, then the
logger command will read from standard input.
logger "System shutdown initiated"
The above command will add the message “System shutdown initiated” to the system log.
echo "System startup initiated" | logger
The above command will read the message “System startup initiated” from standard input and add it to the system log.
logger -p user.info "User login successful"
The above command will add the message “User login successful” to the system log with the priority set to “user.info”.
Here are the available options for the
||Sets the priority of the message. The priority can be specified using the facility.level notation, where facility is one of the following: user, local0, local1, local2, local3, local4, local5, local6, local7. The level can be one of the following: emerg, alert, crit, err, warning, notice, info, debug.|
||Sets the tag for the message. By default, the tag is set to the name of the command that was used to add the message to the system log.|
||Sends the message to the specified socket instead of the default
||Sends the message to standard error instead of the system log.|
||Displays the help message and exits.|
||Displays the version information and exits.|
If you are having trouble adding messages to the system log using the
logger command, here are some troubleshooting tips:
- Ensure that the syslog daemon is running on your system.
- Check the permissions of the
/dev/logsocket. The user running the
loggercommand must have write access to this socket.
- Verify that the message is being added to the correct facility and level. Use the
-poption to set the priority of the message.
loggercommand is typically used in shell scripts to add messages to the system log.
- The system log can be viewed using the
syslogcommand or by examining the contents of the