wall(1)wall(1)NAMEwall - Sends a message to all users logged into the local system or to
all members of a cluster
SYNTAXwall [-c file]
OPTIONS
Send message to all users logged into all members of a cluster.
DESCRIPTION
The wall command reads from standard input until you press the End-of-
File key sequence, or takes its input from the contents of file if you
specify it, and sends the input as a message to all users who are
logged in. The message is preceded by the heading:
Broadcast Message from user@node (tty) at hh:mm
where user is the user invoking wall, node and tty are the node and
terminal of that user, and hh:mm is the time of the message.
To override any protections other users have set up, you must be oper‐
ating with superuser authority. Typically, the root user uses wall to
warn all users of an impending system shutdown.
FILES
To suspend error messages. Clusterwide message-sending utility called
by the wall command.
SEE ALSO
Commands: mesg(1), su(1), talk(1), write(1)wall(1)