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From: Travis Siegel <tsiegel@softcon.com>
To: "Speakup is a screen review system for Linux." <speakup@braille.uwo.ca>
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Subject: Re: System wide message:
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The program used to send messages to everyone logged on is wall.
I.E.
wall system is going down for reboot in 10 minutes
would send the message to everyone logged in at the moment.
If you wanted to send it to just one person, use write <user-id>
If there's only one person logged in, then they efectively do the same
thing.