LOGGER(1) BSD General Commands Manual LOGGER(1)


logger − make entries in the system log


logger [−is] [−f file] [−p pri] [−t tag] [−u socket] [message ...]


Logger provides a shell command interface to the syslog(3) system log module.


      −i’         Log the process id of the logger process with each line.

−s’ Log the message to standard error, as well as the system log.

−f file
Log the specified file.

−p 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.’’

−t tag
Mark every line in the log with the specified tag.

−u sock
Write to socket as specified with socket instead of builtin syslog routines.

--’ End the argument list. This is to allow the message to start with a hyphen (−). This feature was not present in the original BSD logger command; it is a GNU-specific extra.

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, 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).


      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.

4.3 Berkeley Distribution June 6, 1993 4.3 Berkeley Distribution