NAME
     wall - write a message to users

SYNOPSIS
     wall [file]

DESCRIPTION
     Wall displays the contents of file or, by default, its standard input, on
     the terminals of all currently logged in users.

     Only the super-user can write on the terminals of users who have chosen
     to deny messages or are using a program which automatically denies mes-
     sages.

SEE ALSO
     mesg(1),  talk(1),  write(1),  shutdown(8)

HISTORY
     A wall command appeared in Version 7 AT&T UNIX.