NAMEwall - write a message to users
SYNOPSISwall [-n] [file]
DESCRIPTIONWall 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 messages. Reading from a file is refused when the invoker is not superuser and the program is suid or sgid.
OPTIONS-n Supress banner
SEE ALSOmesg(1), talk(1), write(1), shutdown(8)
HISTORYA wall command appeared in Version 7 AT&T UNIX.
AVAILABILITYThe wall command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. WALL(1)