What parameters can be passed to the bash shell so that it displays the motd?
bash -l display the motd?
bash -l does not display the Message of the Day. From
motd(5)'s manual page:
NAME motd - message of the day
DESCRIPTION The contents of /etc/motd are displayed by pam_motd(8) after a successful login but just before it executes the login shell.
To have your shell do it, add
cat /etc/motd to your profile or shell rcfile.