NAME

wall − write to all users

SYNOPSIS

wall

DESCRIPTION

Wall reads its standard input until an end-of-file.  It then sends the message, preceded by "Broadcast Message ...", to all logged in users. 

Only the super-user can override any protections against receiving messages that users may have invoked.  The message is also labeled with the sender’s name and terminal number and the time the message was sent. 

EXAMPLE

wall

will broadcast the standard input to all users who are not protected against receiving messages by the mesg command. 

FILES

/dev/tty? 
/etc/utmp

SEE ALSO

mesg(1), write(1)

DIAGNOSTICS

"Cannot send to ..." when the open on a user’s tty file fails. 

7th Edition  —  1/27/82