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Full Discussion: wall
Top Forums UNIX for Dummies Questions & Answers wall Post 14476 by LivinFree on Friday 1st of February 2002 01:00:04 AM
Old 02-01-2002
I would do it the way wizard suggests...
First, I would make a list of all terminal devices, then read from that list and echo a message:
Code:
 # cat term-list
/dev/tty2
/dev/tty3
/dev/tty4
 #
 # cat send_message.sh
#!/usr/bin/sh
for each in `cat term-list`
do
echo "\n\n\n\n\tPlease log out until 10:00 PM" >>$each
echo "I am currently rebuilding the database" >>$each
done
 #

You might want to leave your terminal out of the list, do you're screen doesn't get interrupted, and maybe also send out a wall message to everyone logged in first, so their terminal doesn't get screwed up right before they have to log out.
 

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LEARN ABOUT XFREE86

systemd-ask-password-console.service

SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8) 	       systemd-ask-password-console.service		   SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8)

NAME

       systemd-ask-password-console.service, systemd-ask-password-console.path, systemd-ask-password-wall.service, systemd-ask-password-wall.path
       - Query the user for system passwords on the console and via wall

SYNOPSIS

       systemd-ask-password-console.service

       systemd-ask-password-console.path

       systemd-ask-password-wall.service

       systemd-ask-password-wall.path

DESCRIPTION

       systemd-ask-password-console.service is a system service that queries the user for system passwords (such as hard disk encryption keys and
       SSL certificate passphrases) on the console. It is intended to be used during boot to ensure proper handling of passwords necessary for
       boot.  systemd-ask-password-wall.service is a system service that informs all logged in users for system passwords via wall(1). It is
       intended to be used after boot to ensure that users are properly notified.

       See the developer documentation[1] for more information about the system password logic.

       Note that these services invoke systemd-tty-ask-password-agent(1) with either the --watch --console or --watch --wall command line
       parameters.

SEE ALSO

       systemd(1), systemd-tty-ask-password-agent(1), wall(1)

NOTES

	1. developer documentation
	   https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents

systemd 237												   SYSTEMD-ASK-PASSWORD-CONSOLE.SERVICE(8)
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