1WALL(1) General Commands Manual WALL(1)
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6 wall - write to all users
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9 wall
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12 Wall reads its standard input until an end-of-file. It then sends this
13 message, preceded by `Broadcast Message ...', to all logged in users.
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15 The sender should be super-user to override any protections the users
16 may have invoked.
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19 /dev/tty?
20 /var/run/utmp
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23 mesg(1), write(1)
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26 `Cannot send to ...' when the open on a user's tty file fails.
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304th Berkeley Distribution November 27, 1996 WALL(1)