pam_motd(8) - man - phpman

PAM_MOTD(8)                               Linux-PAM Manual                               PAM_MOTD(8)



NAME
       pam_motd - Display the motd file

SYNOPSIS
       pam_motd.so [motd=/path/filename] [motd_dir=/path/dirname.d]

DESCRIPTION
       pam_motd is a PAM module that can be used to display arbitrary motd (message of the day)
       files after a successful login. By default, pam_motd shows files in the following locations:

           /etc/motd
           /run/motd
           /usr/lib/motd
           /etc/motd.d/
           /run/motd.d/
           /usr/lib/motd.d/

       Each message size is limited to 64KB.

       If /etc/motd does not exist, then /run/motd is shown. If /run/motd does not exist, then
       /usr/lib/motd is shown.

       Similar overriding behavior applies to the directories. Files in /etc/motd.d/ override files
       with the same name in /run/motd.d/ and /usr/lib/motd.d/. Files in /run/motd.d/ override files
       with the same name in /usr/lib/motd.d/.

       Files the in the directories listed above are displayed in lexicographic order by name.

       To silence a message, a symbolic link with target /dev/null may be placed in /etc/motd.d with
       the same filename as the message to be silenced. Example: Creating a symbolic link as follows
       silences /usr/lib/motd.d/my_motd.

       ln -s /dev/null /etc/motd.d/my_motd

       The MOTD_SHOWN=pam environment variable is set after showing the motd files, even when all of
       them were silenced using symbolic links.

OPTIONS
       motd=/path/filename
           The /path/filename file is displayed as message of the day. Multiple paths to try can be
           specified as a colon-separated list. By default this option is set to
           /etc/motd:/run/motd:/usr/lib/motd.

       motd_dir=/path/dirname.d
           The /path/dirname.d directory is scanned and each file contained inside of it is
           displayed. Multiple directories to scan can be specified as a colon-separated list. By
           default this option is set to /etc/motd.d:/run/motd.d:/usr/lib/motd.d.

       noupdate
           Don't run the scripts in /etc/update-motd.d to refresh the motd file.

       When no options are given, the default behavior applies for both options. Specifying either
       option (or both) will disable the default behavior for both options.

MODULE TYPES PROVIDED
       Only the session module type is provided.

RETURN VALUES
       PAM_ABORT
           Not all relevant data or options could be obtained.

       PAM_BUF_ERR
           Memory buffer error.

       PAM_IGNORE
           This is the default return value of this module.

EXAMPLES
       The suggested usage for /etc/pam.d/login is:

           session  optional  pam_motd.so


       To use a motd file from a different location:

           session  optional  pam_motd.so motd=/elsewhere/motd


       To use a motd file from elsewhere, along with a corresponding .d directory:

           session  optional  pam_motd.so motd=/elsewhere/motd motd_dir=/elsewhere/motd.d



SEE ALSO
       motd(5), pam.conf(5), pam.d(5), pam(7), update-motd(5)

AUTHOR
       pam_motd was written by Ben Collins <bcollins AT debian.org>.

       The motd_dir= option was added by Allison Karlitskaya <allison.karlitskaya AT redhat.com>.



Linux-PAM Manual                             06/08/2020                                  PAM_MOTD(8)