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BSD 2.11 - man page for wall (bsd section 1)

WALL(1) 				       General Commands Manual					      WALL(1)

NAME
wall - write to all users
SYNOPSIS
wall
DESCRIPTION
Wall reads its standard input until an end-of-file. It then sends this message, preceded by `Broadcast Mes- sage ...', to all logged in users. The sender should be super-user to override any protections the users may have invoked.
FILES
/dev/tty? /var/run/utmp
SEE ALSO
mesg(1), write(1)
DIAGNOSTICS
`Cannot send to ...' when the open on a user's tty file fails. 4th Berkeley Distribution November 27, 1996 WALL(1)


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