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Linux in a Nutshell

This directory of Linux commands is from Linux in a Nutshell, 5th Edition.

Click on any of the 687 commands below to get a description and list of available options. All links in the command summaries point to the online version of the book on Safari Bookshelf.

Buy it now, or read it online on Safari Bookshelf.


logger [options] [message...]

TCP/IP command. Add entries to the system log (via syslogd). If no message is given on the command line, standard input is logged.



When writing to a socket with -s, use a datagram instead of a stream.

-f file

Read message from file.


Include the process ID of the logger process.

-p pri

Enter message with the specified priority pri. Default is user.notice.


Log message to standard error as well as to the system log.

-t tag

Mark every line in the log with the specified tag.

-u socket

Write log to socket instead of to the syslog.


Accept no further options. Consider whatever is to the right of the hyphens as the message to be logged.

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