LOGGER(1) General Commands Manual LOGGER(1)

logger — make entries in the system log

logger [-is] [-f file] [-p pri] [-t tag] [message ...]

The logger utility provides a shell command interface to the syslog(3) system log module.

The following options are available:

Log the process id of the logger process with each line. This flag is ignored and the process id is always logged.
Log the message to standard error, as well as the system log.
file
Read the contents of the specified file into syslog. This option is ignored when a message is also specified.
pri
Enter the message with the specified priority. The priority may be specified numerically or as a facility.level pair. For example, “-p local3.info” logs the message(s) as informational level in the local3 facility. The default is “user.notice”.
tag
Mark every line in the log with the specified tag rather than the default of current login name.
message
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.

logger System rebooted

logger -p local0.notice -t HOSTIDM -f /dev/idmc

syslog(3), syslogd(8)

The logger command is expected to be IEEE Std 1003.2 (“POSIX.2”) compatible.

March 16, 2022 macOS 15.2