| WALL(1) | General Commands Manual | WALL(1) | 
NAME
 wall — write a message to users
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 messages.
- 
-g
- 
Send messages to users in this group. This option may be specified multiple times, and any user in any of the specified groups will receive the message.
 
HISTORY
 A wall command appeared in Version 7 AT&T UNIX. Support for -g was added in NetBSD 2.0 (from OpenBSD 2.0).