motd - message of the day
The contents of /etc/motd are displayed by pam_motd(8) after a successful login but just before it executes the login shell.
The abbreviation "motd" stands for "message of the day", and this file has been traditionally used for exactly that (it requires much less disk space than mail to all users).
On Debian GNU/Linux, the content of /run/motd.dynamic is also displayed. This file is generated by /etc/init.d/motd at boot.
login(1), issue(5) pam_motd(8)
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.