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I've run into an issue trying to set up a little bit of ASCII art to display upon connection and on logout.

I can do this for one user with .bashrc and with .bash_logout, and set a login MOTD by creating /etc/profile.d/motd.sh, but haven't found a way to set a universal logout MOTD. How can I do this?

I am running CentOS 6.

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    It isn't clear what you're asking. motd is a message ("message of the day", thus motd), that is used for announces such as "This machine will be down for scheduled maintenance on Friday between 12:00 and 14:00". .bash_logout is a script. You can set a .bash_logout script for new users by adding it to /etc/skel, and you can add commands to .bash_logout for existing users with a script. But (1) it's pointless to print messages from .bash_logout (since the shell is going away...), and .bash_logout only applies to people who has bash as their shell. – lcd047 Jun 8 '15 at 15:37
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From the manual (man bash):

When a login shell exits, bash reads and executes commands from the files ~/.bash_logout and /etc/bash.bash_logout, if the files exists.

There is another answer on U&L SE on login messages.

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    Only if #define SYS_BASH_LOGOUT is uncommented in config-top.h when building bash. it is commented out by default and not many packagers enable it either. – llua Jun 8 '15 at 17:34
  • bash on CentOS 7 has it enabled. – jnas Sep 19 '16 at 7:54
  • Works fine for me using Ubuntu 16.04 LTS. – CyberFonic Apr 4 '17 at 8:53

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