To use wall, enter:
Enter your message. Press <Ctrl-D> when you are finished, and wall sends the message.wall
You can also compose the message in a file, then send it using wall:
The wall command is not affected by a user's mesg setting. That is, a user cannot stop wall from displaying on his or her screen. On a graphics display with multiple windows, the message is displayed in all windows.wall < messagefile
Chapter 5 provides information on configuring your system disk space for maximum effectiveness, including allocating swap space for the operating system kernel. Topics described in this chapter include: