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Top Forums UNIX for Advanced & Expert Users GNU Screen: Send to Multiple Screens at Once? Post 302164371 by Dave Miller on Monday 4th of February 2008 04:26:04 PM
Old 02-04-2008
Try the 'wall' command.

On my system, the 'wall' command will send a short message to everyone that's logged in.

That's good except:
It kinda screws up thier screen till they do a screen refresh. And, if whatever they were doing was about to do a refresh, they'll miss it.
 

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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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