rwall | Send a message to users logged on a host | Mehr ...
The rwall command sends a message to the users logged into the specified host. The message to be sent can be typed in and terminated with EOF or it can be in a file.
rwalld | Write messages to users currently logged in server | Mehr ...
rpc.rwalld is a server which will send a message to users currently logged in to the system. This server invokes the wall(1) command to actually write the messages to the system.
