|Linux / Unix Command: wall|
NAMEwall -- send a message to everybody's terminal.
SYNOPSISwall [ message ]
DESCRIPTIONWall sends a message to everybody logged in with their mesg(1) permission set to yes. The message can be given as an argument to wall, or it can be sent to wall's standard input. When using the standard input from a terminal, the message should be terminated with the EOF key (usually Control-D).
SEE ALSOmesg(1), rpc.rwalld(8).
Important: Use the man command (% man) to see how a command is used on your particular computer.