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wall [-n] [ message ]
Wall sends a message to everybody logged in with their mesg(1) permis-
sion set to yes. The message can be given as an argument to wall, or
it can be sent to wall's standard input. When using the standard input
from a terminal, the message should be terminated with the EOF key
The length of the message is limited to 20 lines. For every invocation
of wall a notification will be written to syslog, with facility
LOG_USER and level LOG_INFO.
-n Suppresses the normal banner printed by wall, changing it to
"Remote broadcast message". This option is only available for
root if wall is installed set-group-id, and is used by
Wall ignores the TZ variable - the time printed in the banner is based
on the system's local time.
Miquel van Smoorenburg, firstname.lastname@example.org
15 April 2003 WALL(1)