NAME

wall − write to all users

SYNTAX

wall

DESCRIPTION

The wall command reads its standard input until an end-of-file.  It then sends this message, preceded by ‘Broadcast Message ...’, to all logged in users. 

The sender should be super-user to override any protections the users may have invoked. 

DIAGNOSTICS

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

FILES

/dev/tty? 
/etc/utmp

SEE ALSO

mesg(1), write(1)